Embed Size (px)
Citation preview
The Mole - Chapter 7 Name Chemistry
Mole Concept
1 How many atoms of carbon are in five molecules of propane (C3H8)
2 How many atoms of hydrogen are in five moles of propane(C3H8)
3 How many moles of carbon are in five moles of propane (C3H8)
4 The mass in grams of one mole of sodium atoms is
5 The mass in grams of one sodium atom is
6 One mole of CO2 contains molecules of CO2
7 One mole of CO2 contains grams of CO2
8 One mole of CO2 contains atoms of carbon
9 The molar mass of CO2 is
10 One mole of CO2 contains atoms of oxygen
11 Two moles of MgSO47H2O contains moles of water
12 Two moles of MgSO47H2O contains atoms of oxygen
13 Two moles of MgSO47H2O contain moles of magnesium
14 Two moles of MgSO47H2O contain grams of MgSO47H2O
15 What is the mass of 6022 x 1023 molecules of water
216 What is the molar mass of aluminum chromate
17 What is the mass of 1 mol Be(OH)2
18 What is the mass of 6022 x 1023 atoms of phosphorus
19 What is the molar mass of zinc acetate
Mole Conversions Show the complete dimensional analysis setup Include proper units and significant figures in the answers
20 Convert to moles
a 49 x 1021 molecules of CH3Br
b 1196 g sodium hydroxide
c 00987 g dinitrogen pentoxide
21 Convert to grams
a 2036 x 1022 molecules of sulfur dioxide
b 00992 moles calcium chloride
c 108 x 1024 formula units of aluminum sulfate
322 Convert to number of particles (identify the appropriate particle)
a 001589 g CH4
b 36 mol lithium nitrate
c 1509 grams of potassium chlorate
23 The following questions are based on the compound potassium phosphate
a What is the molar mass of the compound
b How many moles are in 236 g of this compound
c How many formula units are in 1599 mol
d How many grams are in 1335 x 1024 formula units
e How many oxygen atoms are in 16 g of the compound
f How many grams of potassium are in 203 g of the compound
424 How many oxygen atoms are in 521 mol sulfuric acid
25 How many carbon atoms are in 234g C3H6
26 How many moles of nitrogen are in 655 x 1023 formula units of magnesium nitride
27 How many protons are in 136 kg of silver
Molar Volume of Gases at STP
28 How many moles of CO2 are in 397 L CO2 at STP
29 What is the mass of 2036 L of sulfur dioxide at STP
30 How many molecules of chlorine are in 1509 L of Cl2 at STP
531 Determine the volume of each of the following gases at STP
a 0945 g carbon monoxide
b 844 x 1022 molecules of hydrogen sulfide
c 116 mol dinitrogen pentoxide
32 How many hydrogen atoms will be in 1533 L of NH3 at STP
33 The volume of a sample of fluorine gas at STP is measured to be 459 mL How many fluorine atoms are present in the sample
Ideal Gas Law
34 What pressure is required for 0230 moles of Argon to occupy a volume of 150 L at 300 degC
35 What is the Celsius temperature of 0987 g of NO2 at 728 mmHg if it has a volume of 568 mL
636 How many grams of nitrogen occupy a volume of 154 mL at 746 torr and 25degC
37 How many grams of pentene C5H10 occupy a volume of 369 mL at 158 kPa and 72degC
38 Determine the molar mass of an unknown gas if a 108 g sample occupies a volume of 593 mL at 33degC and 746 mm Hg
39 What is the pressure of 294 g of ethane C2H6 if it has a volume of 832 mL at minus24degC
40 Determine the molar mass of a gas collected over water in a eudiometer equilibrated with the atmosphere given the following data
Mass of gas 00835 gWater Temperature 600degCBarometric Pressure 7528 torrVolume of trapped gas 349 mL
741 Determine the density of the following gases
a fluorine at STP
b sulfur trioxide at 600degC and 1652 kPa
42 At what temperature will chlorine gas at 722 mmHg have a density of 148 gL
Empirical and Molecular Formulas
43 A compound is analyzed and is determined to consist of 1723g of carbon 0288g of hydrogen and 0459g of oxygen What is the empirical formula of the compound
44 Determine the empirical formula of a compound that is 2474 potassium 3476 manganese and 4050 oxygen
45 An unknown compound is analyzed Its composition was determined to be 5185 carbon 864 hydrogen and 3951 oxygen What is the empirical formula
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
216 What is the molar mass of aluminum chromate
17 What is the mass of 1 mol Be(OH)2
18 What is the mass of 6022 x 1023 atoms of phosphorus
19 What is the molar mass of zinc acetate
Mole Conversions Show the complete dimensional analysis setup Include proper units and significant figures in the answers
20 Convert to moles
a 49 x 1021 molecules of CH3Br
b 1196 g sodium hydroxide
c 00987 g dinitrogen pentoxide
21 Convert to grams
a 2036 x 1022 molecules of sulfur dioxide
b 00992 moles calcium chloride
c 108 x 1024 formula units of aluminum sulfate
322 Convert to number of particles (identify the appropriate particle)
a 001589 g CH4
b 36 mol lithium nitrate
c 1509 grams of potassium chlorate
23 The following questions are based on the compound potassium phosphate
a What is the molar mass of the compound
b How many moles are in 236 g of this compound
c How many formula units are in 1599 mol
d How many grams are in 1335 x 1024 formula units
e How many oxygen atoms are in 16 g of the compound
f How many grams of potassium are in 203 g of the compound
424 How many oxygen atoms are in 521 mol sulfuric acid
25 How many carbon atoms are in 234g C3H6
26 How many moles of nitrogen are in 655 x 1023 formula units of magnesium nitride
27 How many protons are in 136 kg of silver
Molar Volume of Gases at STP
28 How many moles of CO2 are in 397 L CO2 at STP
29 What is the mass of 2036 L of sulfur dioxide at STP
30 How many molecules of chlorine are in 1509 L of Cl2 at STP
531 Determine the volume of each of the following gases at STP
a 0945 g carbon monoxide
b 844 x 1022 molecules of hydrogen sulfide
c 116 mol dinitrogen pentoxide
32 How many hydrogen atoms will be in 1533 L of NH3 at STP
33 The volume of a sample of fluorine gas at STP is measured to be 459 mL How many fluorine atoms are present in the sample
Ideal Gas Law
34 What pressure is required for 0230 moles of Argon to occupy a volume of 150 L at 300 degC
35 What is the Celsius temperature of 0987 g of NO2 at 728 mmHg if it has a volume of 568 mL
636 How many grams of nitrogen occupy a volume of 154 mL at 746 torr and 25degC
37 How many grams of pentene C5H10 occupy a volume of 369 mL at 158 kPa and 72degC
38 Determine the molar mass of an unknown gas if a 108 g sample occupies a volume of 593 mL at 33degC and 746 mm Hg
39 What is the pressure of 294 g of ethane C2H6 if it has a volume of 832 mL at minus24degC
40 Determine the molar mass of a gas collected over water in a eudiometer equilibrated with the atmosphere given the following data
Mass of gas 00835 gWater Temperature 600degCBarometric Pressure 7528 torrVolume of trapped gas 349 mL
741 Determine the density of the following gases
a fluorine at STP
b sulfur trioxide at 600degC and 1652 kPa
42 At what temperature will chlorine gas at 722 mmHg have a density of 148 gL
Empirical and Molecular Formulas
43 A compound is analyzed and is determined to consist of 1723g of carbon 0288g of hydrogen and 0459g of oxygen What is the empirical formula of the compound
44 Determine the empirical formula of a compound that is 2474 potassium 3476 manganese and 4050 oxygen
45 An unknown compound is analyzed Its composition was determined to be 5185 carbon 864 hydrogen and 3951 oxygen What is the empirical formula
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
322 Convert to number of particles (identify the appropriate particle)
a 001589 g CH4
b 36 mol lithium nitrate
c 1509 grams of potassium chlorate
23 The following questions are based on the compound potassium phosphate
a What is the molar mass of the compound
b How many moles are in 236 g of this compound
c How many formula units are in 1599 mol
d How many grams are in 1335 x 1024 formula units
e How many oxygen atoms are in 16 g of the compound
f How many grams of potassium are in 203 g of the compound
424 How many oxygen atoms are in 521 mol sulfuric acid
25 How many carbon atoms are in 234g C3H6
26 How many moles of nitrogen are in 655 x 1023 formula units of magnesium nitride
27 How many protons are in 136 kg of silver
Molar Volume of Gases at STP
28 How many moles of CO2 are in 397 L CO2 at STP
29 What is the mass of 2036 L of sulfur dioxide at STP
30 How many molecules of chlorine are in 1509 L of Cl2 at STP
531 Determine the volume of each of the following gases at STP
a 0945 g carbon monoxide
b 844 x 1022 molecules of hydrogen sulfide
c 116 mol dinitrogen pentoxide
32 How many hydrogen atoms will be in 1533 L of NH3 at STP
33 The volume of a sample of fluorine gas at STP is measured to be 459 mL How many fluorine atoms are present in the sample
Ideal Gas Law
34 What pressure is required for 0230 moles of Argon to occupy a volume of 150 L at 300 degC
35 What is the Celsius temperature of 0987 g of NO2 at 728 mmHg if it has a volume of 568 mL
636 How many grams of nitrogen occupy a volume of 154 mL at 746 torr and 25degC
37 How many grams of pentene C5H10 occupy a volume of 369 mL at 158 kPa and 72degC
38 Determine the molar mass of an unknown gas if a 108 g sample occupies a volume of 593 mL at 33degC and 746 mm Hg
39 What is the pressure of 294 g of ethane C2H6 if it has a volume of 832 mL at minus24degC
40 Determine the molar mass of a gas collected over water in a eudiometer equilibrated with the atmosphere given the following data
Mass of gas 00835 gWater Temperature 600degCBarometric Pressure 7528 torrVolume of trapped gas 349 mL
741 Determine the density of the following gases
a fluorine at STP
b sulfur trioxide at 600degC and 1652 kPa
42 At what temperature will chlorine gas at 722 mmHg have a density of 148 gL
Empirical and Molecular Formulas
43 A compound is analyzed and is determined to consist of 1723g of carbon 0288g of hydrogen and 0459g of oxygen What is the empirical formula of the compound
44 Determine the empirical formula of a compound that is 2474 potassium 3476 manganese and 4050 oxygen
45 An unknown compound is analyzed Its composition was determined to be 5185 carbon 864 hydrogen and 3951 oxygen What is the empirical formula
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
424 How many oxygen atoms are in 521 mol sulfuric acid
25 How many carbon atoms are in 234g C3H6
26 How many moles of nitrogen are in 655 x 1023 formula units of magnesium nitride
27 How many protons are in 136 kg of silver
Molar Volume of Gases at STP
28 How many moles of CO2 are in 397 L CO2 at STP
29 What is the mass of 2036 L of sulfur dioxide at STP
30 How many molecules of chlorine are in 1509 L of Cl2 at STP
531 Determine the volume of each of the following gases at STP
a 0945 g carbon monoxide
b 844 x 1022 molecules of hydrogen sulfide
c 116 mol dinitrogen pentoxide
32 How many hydrogen atoms will be in 1533 L of NH3 at STP
33 The volume of a sample of fluorine gas at STP is measured to be 459 mL How many fluorine atoms are present in the sample
Ideal Gas Law
34 What pressure is required for 0230 moles of Argon to occupy a volume of 150 L at 300 degC
35 What is the Celsius temperature of 0987 g of NO2 at 728 mmHg if it has a volume of 568 mL
636 How many grams of nitrogen occupy a volume of 154 mL at 746 torr and 25degC
37 How many grams of pentene C5H10 occupy a volume of 369 mL at 158 kPa and 72degC
38 Determine the molar mass of an unknown gas if a 108 g sample occupies a volume of 593 mL at 33degC and 746 mm Hg
39 What is the pressure of 294 g of ethane C2H6 if it has a volume of 832 mL at minus24degC
40 Determine the molar mass of a gas collected over water in a eudiometer equilibrated with the atmosphere given the following data
Mass of gas 00835 gWater Temperature 600degCBarometric Pressure 7528 torrVolume of trapped gas 349 mL
741 Determine the density of the following gases
a fluorine at STP
b sulfur trioxide at 600degC and 1652 kPa
42 At what temperature will chlorine gas at 722 mmHg have a density of 148 gL
Empirical and Molecular Formulas
43 A compound is analyzed and is determined to consist of 1723g of carbon 0288g of hydrogen and 0459g of oxygen What is the empirical formula of the compound
44 Determine the empirical formula of a compound that is 2474 potassium 3476 manganese and 4050 oxygen
45 An unknown compound is analyzed Its composition was determined to be 5185 carbon 864 hydrogen and 3951 oxygen What is the empirical formula
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
531 Determine the volume of each of the following gases at STP
a 0945 g carbon monoxide
b 844 x 1022 molecules of hydrogen sulfide
c 116 mol dinitrogen pentoxide
32 How many hydrogen atoms will be in 1533 L of NH3 at STP
33 The volume of a sample of fluorine gas at STP is measured to be 459 mL How many fluorine atoms are present in the sample
Ideal Gas Law
34 What pressure is required for 0230 moles of Argon to occupy a volume of 150 L at 300 degC
35 What is the Celsius temperature of 0987 g of NO2 at 728 mmHg if it has a volume of 568 mL
636 How many grams of nitrogen occupy a volume of 154 mL at 746 torr and 25degC
37 How many grams of pentene C5H10 occupy a volume of 369 mL at 158 kPa and 72degC
38 Determine the molar mass of an unknown gas if a 108 g sample occupies a volume of 593 mL at 33degC and 746 mm Hg
39 What is the pressure of 294 g of ethane C2H6 if it has a volume of 832 mL at minus24degC
40 Determine the molar mass of a gas collected over water in a eudiometer equilibrated with the atmosphere given the following data
Mass of gas 00835 gWater Temperature 600degCBarometric Pressure 7528 torrVolume of trapped gas 349 mL
741 Determine the density of the following gases
a fluorine at STP
b sulfur trioxide at 600degC and 1652 kPa
42 At what temperature will chlorine gas at 722 mmHg have a density of 148 gL
Empirical and Molecular Formulas
43 A compound is analyzed and is determined to consist of 1723g of carbon 0288g of hydrogen and 0459g of oxygen What is the empirical formula of the compound
44 Determine the empirical formula of a compound that is 2474 potassium 3476 manganese and 4050 oxygen
45 An unknown compound is analyzed Its composition was determined to be 5185 carbon 864 hydrogen and 3951 oxygen What is the empirical formula
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
636 How many grams of nitrogen occupy a volume of 154 mL at 746 torr and 25degC
37 How many grams of pentene C5H10 occupy a volume of 369 mL at 158 kPa and 72degC
38 Determine the molar mass of an unknown gas if a 108 g sample occupies a volume of 593 mL at 33degC and 746 mm Hg
39 What is the pressure of 294 g of ethane C2H6 if it has a volume of 832 mL at minus24degC
40 Determine the molar mass of a gas collected over water in a eudiometer equilibrated with the atmosphere given the following data
Mass of gas 00835 gWater Temperature 600degCBarometric Pressure 7528 torrVolume of trapped gas 349 mL
741 Determine the density of the following gases
a fluorine at STP
b sulfur trioxide at 600degC and 1652 kPa
42 At what temperature will chlorine gas at 722 mmHg have a density of 148 gL
Empirical and Molecular Formulas
43 A compound is analyzed and is determined to consist of 1723g of carbon 0288g of hydrogen and 0459g of oxygen What is the empirical formula of the compound
44 Determine the empirical formula of a compound that is 2474 potassium 3476 manganese and 4050 oxygen
45 An unknown compound is analyzed Its composition was determined to be 5185 carbon 864 hydrogen and 3951 oxygen What is the empirical formula
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
741 Determine the density of the following gases
a fluorine at STP
b sulfur trioxide at 600degC and 1652 kPa
42 At what temperature will chlorine gas at 722 mmHg have a density of 148 gL
Empirical and Molecular Formulas
43 A compound is analyzed and is determined to consist of 1723g of carbon 0288g of hydrogen and 0459g of oxygen What is the empirical formula of the compound
44 Determine the empirical formula of a compound that is 2474 potassium 3476 manganese and 4050 oxygen
45 An unknown compound is analyzed Its composition was determined to be 5185 carbon 864 hydrogen and 3951 oxygen What is the empirical formula
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
846 Determine the empirical formula of a compound that is 2023 aluminum and 7977 chlorine
47 Determine the molecular formula of a compound that contains and 8421 carbon and 1579 hydrogen The molar mass of the compound is 1140gmol
48 Find the molecular formula of a compound with a molar mass of 2839 gmol that is composed of 4364g of phosphorous and 5636g of oxygen
49 A compound is found to be 471 carbon 654H and 464 chlorine The rate of effusion of this compound in the gaseous state was measured relative to oxygen gas Oxygen was found to effuse at rate that was 219 times faster than this compound Determine the molecular formula of the compound
50 Laundry detergent is Na2CO3 bull x H2O When 2558 g of the hydrate is heated 0948 g of the anhydrous sodium carbonate remains What is the value of x
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
9Percent composition empirical and molecular formulas
51 Calculate the percent composition of lead(IV) phosphate
52 How many grams of nitrogen atoms are in 249 grams of calcium nitride
53 Calculate the percent water in calcium chloride dihydrate
54 Determine the empirical formula of a compound composed of 632 carbon 53 hydrogen and 316 oxygen
55 An unknown gas is determined to have an empirical formula of CH2 If a 0176 g sample of this gas occupies a volume of 350 mL at 134 kPa and 175degC determine its molecular formula
56 Chemical analysis of an unknown compound indicated that the compound consisted of 546 carbon 90 hydrogen and 364 oxygen The molar mass of the compound was found to be 176 gmol Determine the molecular formula
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1057 Epsom salts is MgSO4 bull x H2O where x is a whole number When 5061 g of the hydrate is heated
2472 g of the anhydrous compound remains Calculate the value of x
Solution Concentration Molarity and Molality
58 Determine the molarity of 350 mL of a solution containing 120 g of sucrose C12H22O11
59 What is the molarity of the solution formed by mixing 020 mol of sodium hydroxide with enough water to make 150 ml of solution
60 A solution is prepared by combining 215 g of CaCl2 with 630 g of water The solution is found to have a density of 120 gmL Determine the percent molarity and molality of this solution
61 How many grams of potassium chloride are needed to prepare 0750 L of a 150 M solution of potassium chloride in water
62 400 mL of a 020 M solution is determined to contain 136 g of some unknown solute What is the molar mass of this solute
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1163 How much water needs to be added to 159 g of potassium nitrate to make a solution that is 125 m
64 What is the molality of a 1787 aluminum sulfate solution
65 123g of sucrose is dissolved in 568g of water The solution has a density of 134g mL Determine the molarity molality and percent by mass of the solution
Review
66 Determine the mass of
a 300x1020 N2O molecules
b 000300 mol N2O molecules
c 132 mol N2O
d N2O that contains 000326 g of nitrogen atoms
e 132 L N2O at STP
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1267 Aspartame is an artificial sweetener that is 160 times sweeter than sucrose when dissolved in water It
is marketed as Nutra-Sweet The molecular formula of aspartame is C14H18N2O5
a What is the molar mass of aspartame
b How many moles of molecules are present in 100 g of aspartame
c Calculate the mass of 156 mol aspartame
d How many molecules are in 50 mg aspartame
e How many nitrogen atoms are in 12 g of aspartame
f What is the mass of 10 x 109 molecules of aspartame
g What is the mass in grams of 1 molecule of aspartame
h What is the mass in amu of 1 molecule of aspartame
68 How many protons are in 891 mg of aluminum sulfate
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1369 In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen
(77 K) was discovered The formula of this substance is YBa2Cu3O7 What is the percent composition of this compound
70 How many grams of oxygen can be found in 1526 g of aluminum dichromate
71 How many grams of fluorine gas would occupy a volume of 151 mL at 45degC and 720 torr
72 What is the molar mass of 0296 g of a gas that occupies 698 mL at 723 mm and 37degC
73 A 120g sample of butadiene gas occupies a volume of 416 liters measured at 97degC and 162 atm If butadiene is composed of 8889 carbon and 1111 hydrogen determine the molecular formula
74 In an experiment concentrated hydrochloric acid was reacted with aluminum Hydrogen gas was evolved and was collected over water at 25degC It had a volume of 355 mL The barometer read 7500 mmHg How many moles of hydrogen were collected
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1475 Determine the density of CO at STP
76 What is the relative rates of effusion of nitrogen gas and a different gas that has a density of 129 gL at 115 kPa and 37degC
77 How many molecules of N2O5 would occupy a volume of 765 mL at a pressure of 1343 mm and a temperature of 78degC
78 A 135 g sample of water at 300degC is heated to 1300degC at standard pressure
a How much energy is required to achieve this
b What volume will the steam occupy at these conditions
79 The compound adrenaline contains 5679 carbon 654 hydrogen 2839 oxygen and 828 nitrogen by mass What is the empirical formula of adrenaline
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1580 A compound containing only sulfur and nitrogen is 696 S by mass A 0865 g sample of this
compound is vaporized at 372degC and is found to occupy a volume of 249 mL at standard pressure Determine the empirical and molecular formulas for this compound
81 A hydrocarbon compound is found to be 8571 carbon and 1429 hydrogen by mass When vaporized at 35ordmC 0136 g of the compound occupies a volume of 450 mL and exerts a pressure of 691 torr
82 What is the molality of a 1566 Na2SO4 solution
83 How many grams of aluminum sulfate are required to make 500 mL of a 0250 M solution
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1684 A solution with a total mass of 763 g contains 291 g of sucrose Calculate the molality of the
solution
85 A hydrocarbon fuel (contains only carbon and hydrogen) is burned and is completely converted into carbon dioxide and water If 2641 g of carbon dioxide and 1442 g of water are produced what is the empirical formula of the compound
Cumulative Review Questions
86 An amorphous solid is placed into a graduated cylinder with 136 mL of water The combined mass of the water and solid is 2047 grams and the combined water and solid volume is 152 mL What is the density of the solid in lbsm3 Report the answer using appropriate sig figs and scientific notation
87 Sate the number of p+ n0 and eminus in each of the followinga 67Zn2+ b 91Y3+ c 76As3minus
88 Classify the following as element compound mixture (hetero) or solution
Classificationgasoline
potting soil
orange juice with pulp
zirconium
baking soda
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
1789 A sample of 212At undergoes an alpha decay and electron capture Write the nuclear equations that
represent this process
90 A sample of cadmium-115 has a half-life of 535 hours The original sample mass was measured to be 1647 μg and after a certain amount of time the sample was found to have a mass of 0515 μg How many days had the sample been undergoing radioactive decay
91 Write the appropriate name or formula for each of the following
(NH4)2CrO4 tetraphophorus decoxide
FeCl3 bull 3 H2O tungsten(VI) phosphite
Cl2O7 vanadic acid
H2TeO3 copper(II) chloride dihydrate
Os(CO3)2 arsenous acid
H3As(aq) aluminum oxalate
92 A sample of pure aluminum contains 5234 x 1024 protons What is the mass of the sample
93 A 413 gram sample of water vapor has a temperature of 1268degC and a pressure of 116 atm The heat lost by the cooling of 746 grams of liquid water at 0degC is transferred to the water vapor causing its pressure to change to 1170 torr and its volume to become 133 mL What was the initial volume of the gas in yds3
