Remembering:Molarity

and Stoichiometry

Because we know you brain is getting full!!!

Molarity = moles (Molar) or (M) litres

Calculate the molarity of 18 moles of LiBr

dissolved in 6.0 L.

= 18 moles

6.0 L

= 3.0 M

How many moles of AlF3 are there in 20.5 L of a

0.172 M solution?

How many moles of AlF3 are there in 20.5 L of a

0.172 M solution?

20.5 L x

How many moles of AlF3 are there in 20.5 L of a

0.172 M solution?

20.5 L x

1 L

How many moles of AlF3 are there in 20.5 L of a

0.172 M solution?

20.5 L x 0.172 mole

1 L

How many moles of AlF3 are there in 20.5 L of a

0.172 M solution?

20.5 L x 0.172 mole = 3.53 moles

1 L

STOICHIOMETRY

Stoichiometry is where you use the balancing coefficients to

create a ratio between two different compounds in a

chemical reaction.

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

?g 105 g

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

?g 105 g 2

4

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

?g 105 g

105 g Fe

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

?g 105 g

105 g Fe x 1 mole55.8 g

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

?g 105 g

105 g Fe x 1 mole x 2 mole Fe2O

55.8 g 4 mole Fe

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

?g 105 g

105 g Fe x 1 mole x 2 mole Fe2O x 159.6 g

55.8 g 4 mole Fe 1 mole

1. How many grams Fe2O3 of are required to produce

105 g of Fe?

2Fe2O3 + 3C → 4Fe + 3CO2

?g 105 g

105 g Fe x 1 mole x 2 mole Fe2O x 159.6 g = 150.

g55.8 g 4 mole Fe 1 mole

How many grams of sodium chloride are produced when

you react 65.2 g of sodium carbonate?

1 Na2CO3 + 2 HCl → 2 NaCl + 1 H2O + 1 CO2

How many grams of sodium chloride are produced when

you react 65.2 g of sodium carbonate?

1 Na2CO3 + 2 HCl → 2 NaCl + 1 H2O + 1 CO2

65.2 g ? g

How many grams of sodium chloride are produced when

you react 65.2 g of sodium carbonate?

1 Na2CO3 + 2 HCl → 2 NaCl + 1 H2O + 1 CO2

65.2 g ? g

65.2 g x Na2CO3

2

1

How many grams of sodium chloride are produced when

you react 65.2 g of sodium carbonate?

1 Na2CO3 + 2 HCl → 2 NaCl + 1 H2O + 1 CO2

65.2 g ? g

65.2 g x Na2CO3 x 1 mol Na2CO3

106.0 g Na2CO3

2

1

How many grams of sodium chloride are produced when

you react 65.2 g of sodium carbonate?

1 Na2CO3 + 2 HCl → 2 NaCl + 1 H2O + 1 CO2

65.2 g ? g

65.2 g x Na2CO3 x 1 mol Na2CO3 x 2 mol NaCl

106.0 g Na2CO3 1 mol Na2CO3

2

1

How many grams of sodium chloride are produced when

you react 65.2 g of sodium carbonate?

1 Na2CO3 + 2 HCl → 2 NaCl + 1 H2O + 1 CO2

65.2 g ? g

65.2 g x Na2CO3 x 1 mol Na2CO3 x 2 mol NaCl x 58.5 g NaCl

106.0 g Na2CO3 1 mol Na2CO3 1 mol NaCl

2

1

How many grams of sodium chloride are produced when

you react 65.2 g of sodium carbonate?

1 Na2CO3 + 2 HCl → 2 NaCl + 1 H2O + 1 CO2

65.2 g ? g

65.2 g x Na2CO3 x 1 mol Na2CO3 x 2 mol NaCl x 58.5 g NaCl = 72.0 g

106.0 g Na2CO3 1 mol Na2CO3 1 mol NaCl

2

1

30.2 L of HCl gas (as STP) is dissolved in 0.500 L of water to produce an acid

solution. What volume of 0.200 M Ba(OH)2 will neutralize this solution?

2 HCl + 1 Ba(OH)2 → 2 H2O + 1 BaCl2

30.2 L of HCl gas (as STP) is dissolved in 0.500 L of water to produce an acid

solution. What volume of 0.200 M Ba(OH)2 will neutralize this solution?

2 HCl + 1 Ba(OH)2 → 2 H2O + 1 BaCl2

30.2 L ? L

30.2 L HCl

1

2

30.2 L of HCl gas (as STP) is dissolved in 0.500 L of water to produce an acid

solution. What volume of 0.200 M Ba(OH)2 will neutralize this solution?

2 HCl + 1 Ba(OH)2 → 2 H2O + 1 BaCl2

30.2 L ? L

30.2 L HCl x 1 mol HCl 22.4 L

1

2

30.2 L of HCl gas (as STP) is dissolved in 0.500 L of water to produce an acid

solution. What volume of 0.200 M Ba(OH)2 will neutralize this solution?

2 HCl + 1 Ba(OH)2 → 2 H2O + 1 BaCl2

30.2 L ? L

30.2 L HCl x 1 mol HCl x 1 mol Ba(OH)2 22.4 L 2 mol HCl

1

2

30.2 L of HCl gas (as STP) is dissolved in 0.500 L of water to produce an acid

solution. What volume of 0.200 M Ba(OH)2 will neutralize this solution?

2 HCl + 1 Ba(OH)2 → 2 H2O + 1 BaCl2

30.2 L ? L

30.2 L HCl x 1 mol HCl x 1 mol Ba(OH)2 x 1 L Ba(OH)2 = 22.4 L 2 mol HCl 0.200 mol Ba(OH)2

1

2

30.2 L of HCl gas (as STP) is dissolved in 0.500 L of water to produce an acid

solution. What volume of 0.200 M Ba(OH)2 will neutralize this solution?

2 HCl + 1 Ba(OH)2 → 2 H2O + 1 BaCl2

30.2 L ? L

30.2 L HCl x 1 mol HCl x 1 mol Ba(OH)2 x 1 L Ba(OH)2 = 3.37 L 22.4 L 2 mol HCl 0.200 mol Ba(OH)2

1

2

250. mL of water is added to 100.0 mL of 0.200 M H2SO4. What volume of

0.300 M KOH will neutralize it?

1 H2SO4 + 2 KOH → 2 HOH + 1 K2SO4

250. mL of water is added to 100.0 mL of 0.200 M H2SO4. What volume of

0.300 M KOH will neutralize it?

1 H2SO4 + 2 KOH → 2 HOH + 1 K2SO4

0.100 L ? L

250. mL of water is added to 100.0 mL of 0.200 M H2SO4. What volume of

0.300 M KOH will neutralize it?

1 H2SO4 + 2 KOH → 2 HOH + 1 K2SO4

0.100 L ? L

0.1000 L H2SO4

250. mL of water is added to 100.0 mL of 0.200 M H2SO4. What volume of

0.300 M KOH will neutralize it?

1 H2SO4 + 2 KOH → 2 HOH + 1 K2SO4

0.100 L ? L

0.1000 L H2SO4 x 0.200 mol H2SO4

1L

250. mL of water is added to 100.0 mL of 0.200 M H2SO4. What volume of

0.300 M KOH will neutralize it?

1 H2SO4 + 2 KOH → 2 HOH + 1 K2SO4

0.100 L ? L

0.1000 L H2SO4 x 0.200 mol H2SO4 x 2 mol KOH

1L 1 mol H2SO4

250. mL of water is added to 100.0 mL of 0.200 M H2SO4. What volume of

0.300 M KOH will neutralize it?

1 H2SO4 + 2 KOH → 2 HOH + 1 K2SO4

0.100 L ? L

0.1000 L H2SO4 x 0.200 mol H2SO4 x 2 mol KOH x 1 L KOH

1L 1 mol H2SO4 0.300 mol KOH

250. mL of water is added to 100.0 mL of 0.200 M H2SO4. What volume of

0.300 M KOH will neutralize it?

1 H2SO4 + 2 KOH → 2 HOH + 1 K2SO4

0.100 L ? L

0.1000 L H2SO4 x 0.200 mol H2SO4 x 2 mol KOH x 1 L KOH

1L 1 mol H2SO4 0.300 mol KOH

= 0.133 L of KOH

Homework: Worksheet #4 (in Molarity Unit)