Worksheet Atom & Stoichiometry

7/21/2019 Worksheet Atom & Stoichiometry

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Chapter 1/ Atom & Stoichiometry/ Jan 2016

Worksheet 1.1: Moles

Use the Ar values in Periodic Tale to ans!er these "uestions#

1 $hat is the mass in %rams o one mole o each o the ollo!in%'

a (inc atoms

b lead atoms

c hydro%en atoms

d hydro%en molecules

e sulur atoms

f sulur molecules )S*+

g copper),,+ nitrate)-+ ormula units

h !ater molecules

i sodium chloride ormula units .

2 a o! many moles o atoms are there in each o the ollo!in%'

ive your ans!ers to 3 si%niicant i%ures#

i 4.6 g of zinc

ii 79 g of oxygen

iii 0.156 g of calcium

iv 109.6 g of sodium

v 0.31 g of lead

vi 5.3 g of hydrogen

b $hich o these samples contains the %reatest numer o atoms'

c $hich o these samples contains the smallest numer o atoms' .*

3 o! many moles o molecules are there in each o the ollo!in%'

ive your ans!ers to 3 si%niicant i%ures#

a #0 % o !ater

b 0#0** % o caron dio4ide

c 56#3 % o caron mono4ide

d 0#065 % o ammonia .

4 o! many moles o ormula units are there in each o the ollo!in%'ive your ans!ers to 3 si%niicant i%ures#




a 1#00 % o calcium caronate

b 26#0 % o copper),,+ nitrate)-+

c 7#63 % o (inc chloride

d 0#163 % o aluminium o4ide .

Worksheet 1.2: Numbers of particles

Use the Ar values in Periodic Tale to ans!er "uestions 1 and 2#

1 a o! many moles o atoms are there in 1#00 mol o each o the ollo!in% molecules'

i HNO3

ii 3H!

iii HlO4

iv !H1! "4#

b o! many moles o Ca28 ions are there in 10#0 mol o CaCl2' .1

c o! many moles o Cl 9 ions are there in 3#00 mol o CaCl2' .1

d o! many moles o : 9 ions are there in 0#0500 mol o Al):+3' .1

2 a o! many %rams o caron are there in 0#500 mol o C3*' .2

b o! many %rams o caron are there in 0#100 mol o C*1*' .2

c o! many %rams o nitro%en are there in 2#00 mol o ;:3' .2

d o! many %rams o o4y%en are there in 2#00 mol o ;:3' .2

Use the value o the Avo%adro constant< L< rom =ata sheet 1 to ans!er the ollo!in% "uestions#

3 a o! many molecules are there in each o the ollo!in%'

i 0.100 mol of 3H! "1#

ii 5.00 mol of HNO3 "1#




iii 0.0100 mol of !H1! "1#

b o! many atoms are there in each o the ollo!in%'

i 0.100 mol of 3H! "1#

ii 5.00 mol of HNO3 "1#

iii 0.0100 mol of !H1! "1#

c o! many ions are there in each o the ollo!in%'

i 10.0 mol of al$ "$#

ii 0.0500 mol of %l&OH'3 "$#

Worksheet 1.3: Reacting masses


1 a Calcium o4ide reacts !ith hydrochloric acid accordin% to the ollo!in% e"uation>

Ca: 8 2Cl ? CaCl2 8 2:

$hat mass o calcium chloride orms !hen each o the ollo!in% masses o

calcium o4ide reacts !ith e4cess hydrochloric acid'

i $!.05 g "1#

ii $.!05 g "1#

iii 56.1 (g "1#

iv 11.$$ g "1#

v 1!.7 )onnes "1#

b $hat mass o hydrochloric acid !ould react in each case' .5

c $hat mass o !ater !ould e produced in each case' .5




2 a $rite a alanced symol e"uation and a mass e"uation or the reaction et!een

copper),,+ o4ide )Cu:+ and nitric)-+ acid );:3+#

b $hat mass o copper),,+ nitrate)-+ )Cu);:3+2+ !ill e produced !hen each o the

ollo!in% masses o copper),,+ o4ide reacts !ith e4cess nitric)-+ acid'

i 7.95 g

ii 15.9 g

iii 159 (g "5#

3 $hat masses o caron dio4ide and !ater must react in order to produce each o the

ollo!in% masses o caronic acid )2C:3+'

a 310 %

b 6#20 @%

c 0#155 % .*

4 inc o4ide and suluric)-,+ acid react accordin% to the ollo!in% e"uation>

n: 8 2S: ? nS: 8 2:

$hat masses o (inc o4ide and suluric)-,+ acid must react in order to produce each o

the ollo!in% masses o (inc sulate)-,+'

a 3#00 %

b 17#2 %

c 0#130 % .7

Worksheet 1.4: Empirical formulae


1 The ollo!in% sets o data %ive the percenta%e composition y mass o three dierent

o4ides o sodium# Calculate the empirical ormula o each o4ide o sodium#

a 7#2B sodium< 25#*B o4y%en

b 1#*B sodium< 5*#2B o4y%en

c 5#0B sodium< 1#0B o4y%en .6




2 The ollo!in% sets o data %ive the percenta%e composition y mass o our dierent

o4ides o nitro%en# Calculate the empirical ormula o each o4ide o nitro%en#

a 36#*B nitro%en< 63#2B o4y%en

b 6#7B nitro%en< 53#3B o4y%en

c 25#B nitro%en< 7#1B o4y%en

d 63#6B nitro%en< 36#B o4y%en .*

3 Use the ollo!in% sets o data to calculate the empirical ormula o each o these compounds#

a :ctane is a hydrocaron# 5#00 % o octane contains #21 % o caron#

b 6#5 % o aluminium sulide contains 2#32 % o aluminium#

c :rthoclase< a mineral in eldspar< is a compound o potassium< aluminium< silicon

and o4y%en# 20#00 % o orthoclase contains 2#*1 % o potassium< 1# % o aluminium

and 6#0 % o silicon# .6

4 Phosphorus and sulur orm several dierent compounds# The ollo!in% sets o data

%ive the mass o phosphorus contained in 1#000 % o each o these three compounds#

Calculate the empirical ormula o each compound#

a 1#000 % o compound contains 0#356 % o phosphorus#

b 1#000 % o compound ! contains 0#56 % o phosphorus#

c 1#000 % o compound " contains 0#37 % o phosphorus# .6

Worksheet 1.#: Moles in solution

1 a Calculate the concentration o each o the ollo!in% solutions#

i 0.!40 mol of solu)e dissol*ed in 5.00 dm3 of solu)ion

ii 0.360 mol of solu)e dissol*ed in 300 cm3 of solu)ion




iii 0.0$00 mol of solu)e dissol*ed in $5.0 cm3 of solu)ion

iv $4.0 mol of solu)e dissol*ed in 30.0 dm3 of solu)ion

b i $hich o the solutions aove is the most concentrated'

ii +hich of )he solu)ions a,o*e is )he mos) dilu)e &leas) concen)ra)ed'-

iii +hich of )he solu)ions a,o*e ha*e )he same concen)ra)ion- "7#

2 Calculate the concentration o each o the ollo!in% solutions#

a 0#760 % o potassium nitrate)-+ );:3+ dissolved to ma@e *0#0 cm3 o solution

b 12#0 % o CuS:#52: dissolved to ma@e 100 cm3 o solution

c 5#0 % o %lucose )C612:6+ dissolved to ma@e 300 cm3 o solution

d 120 % o nitric)-+ acid );:3+ dissolved to ma@e 200 cm3 o solution .12

3 o! many moles o solute does each o the ollo!in% samples contain'

a 60#0 cm3 o a 2#00 mol dm 93 solution

b 200 cm3 o a 0#200 mol dm 93 solution

c 0#500 dm3 o a 1#00 mol dm 93 solution

d 12#6 cm3 o a 0#250 mol dm 93 solution .

4 $hat volume o a solution o concentration 0#0*00 mol dm 93 should e measured out

to %ive each o the ollo!in% amounts' ive your ans!ers oth in dm3 and in cm3#

a 0#000100 mol

b 0#000320 mol

c 0#000 mol .6




Worksheet 1.$: %as &olumes

Use the Ar values in Periodic Tale to ans!er these "uestions# Dou !ill also need to @no! the molar

volume o %as at room conditions< !hich can e ound in =ata Eoo@let#

1 $hen calcium caronate is heated stron%ly< it decomposes to %ive calcium o4ide and

caron dio4ide#

a $rite a alanced symol e"uation or this reaction#

b $rite a mass e"uation )in %rams+ and include the volume o caron dio4ide<

measured at r#t#p#

c $hat volume o caron dio4ide< measured at r#t#p#< !ill orm !hen each o the

ollo!in% masses o calcium caronate decomposes'

i 1#00 %

ii 25#0 %

iii 0#0 % .6

2 $hen ammonia %as and hydro%en chloride %as mi4 to%ether< they react to orm a solid

called ammonium chloride#

a $rite a alanced symol e"uation or this reaction#

b $rite a mass e"uation )in %rams+ and include the volumes o ammonia and

hydro%en chloride< measured at r#t#p#

c $hat volumes o ammonia and hydro%en chloride %ases< measured at r#t#p#< must react

in order to produce each o the ollo!in% masses o ammonium chloride'

i 10.7 g

ii $14 g

iii 1.00 g"10#




Worksheet 1.': End(of(chapter test

Use the Ar values in Periodic Tale to ans!er these "uestions# Dou !ill also need to @no! the molar

volume o %as at room conditions< !hich can e ound in =ata Eoo@let#

ive all your ans!ers to 3 si%niicant i%ures#

1 The reaction et!een ;a: and 2S: can e !ritten as>

2S: 8 ;a: ? ;aCl 8 2:

,n such a reaction< 1*#0 cm3 o suluric acid !as neutralised y 12#0 cm3 o

0#000 mol dm 93 sodium hydro4ide#

a $hat !as the volume< in dm3 o>

i )he acid-

ii )he al(ali- "$#

b Calculate the numer o moles o al@ali# .1

c Calculate the numer o moles o acid and then its concentration# .2

2 a 1#*0 dm3 o hydro%en chloride %as !as dissolved in 100 cm3 o !ater#

i Ho many moles of hydrogen chloride gas ere /resen)- "1#

ii +ha) as )he concen)ra)ion of )he hydrochloric acid formed- "$#

b 25#0 cm3 o the acid !as then titrated a%ainst sodium hydro4ide o concentration

0#250 mol dm 93 to orm ;aCl and !ater>

;a:)a"+ 8 Cl)a"+ ? 2:)l+ 8 ;aCl)a"+

i Ho many moles of acid ere used- "$#

ii alcula)e )he *olume of sodium hydroxide used. "4#

3 2#0 dm3 o chlorine %as !as reacted !ith sodium hydro4ide solution# The reaction ta@in%

place !as as ollo!s>

Cl2)%+ 8 2;a:)a"+ ? ;aCl)a"+ 8 ;a:Cl)a"+ 8 2:)l+

a o! many moles o Cl2 reacted' .1

b $hat mass o ;a:Cl !as ormed' .2

c , the concentration o the ;a: !as 1#00 mol dm 93< !hat volume o sodium hydro4ide

solution !as re"uired' .2

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Worksheet Atom & Stoichiometry