Worksheet on Stoichiometry (Show all required parts)
Use the following to answer questions 1 & 2.
NaCl +
MgO 
Na2O + MgCl2
1. If 24 grams of sodium chloride reacts with an excess amount of magnesium oxide, how many
grams of sodium oxide will be produced?
2. If 53 grams of magnesium oxide reacts with an excess amount of sodium chloride, how many
grams of magnesium chloride will be made?
Use the following to answer questions 3 & 4.
Mg3N2 +
K2 O 
MgO + K3N
3. If 14 moles of potassium oxide reacts with an excess amount of magnesium nitride, how many
grams of potassium nitride will be made?
4. How many grams of magnesium nitride is needed to react with an excess amount of potassium
oxide to produce 11.6 grams of magnesium oxide?
Use the following to answer questions 5 - 8.
C3H8 + O2 
H2O +
CO2
5. 32 grams of propane (C3H8) is burned in excess oxygen gas to produce how many grams of
water?
6. How many grams of oxygen gas is needed to make 30 grams of carbon dioxide?
7. If 0.45 grams of water is formed during the combustion of propane, how many grams of
carbon dioxide is formed?
8. How many grams of propane, C3H8, are needed to make 140 grams of water?
Worksheet on Stoichiometry (Show all required parts)
Use the following to answer questions 1 & 2.
2 NaCl +
MgO 
Na2O + MgCl2
1. If 24 grams of sodium chloride reacts with an excess amount of magnesium oxide, how many
grams of sodium oxide will be produced?
A
B
Given: 24 g NaCl = ? grams Na2O
Conversions: Molar mass of NaCl: 1 mole NaCl = 58 g NaCl
Mole to mole ratio: 2 mole NaCl = 1 mole Na2O
Molar mass of Na2O: 1 mole Na2O = 62 g Na2O
Setup:
24 g NaCl
X 1 mole NaCl X 1 mole Na2O X 62 g Na2O = 12.8 g Na2O
58 grams NaCl 2 mole NaCl
1 mole Na2O
2. If 53 grams of magnesium oxide reacts with an excess amount of sodium chloride, how many
grams of magnesium chloride will be made?
A
B
Given: 53 g MgO = ? g MgCl2
Conversions: Molar mass of MgO: 1 mole MgO = 40 g MgO
Mole to Mole Ratio : 1 mole MgO = 1 mole MgCl2
Molar mass of MgCl2 : 1 mole MgCl2 = 94 g MgCl2
Setup:
53 g MgO
X 1 mole MgO
40 g MgO
X 1 mole MgCl2
1 mole MgO
X
94 g MgCl2
1 mole MgCl;2
= 124.55 g MgCl2
Use the following to answer questions 3 & 4.
Mg3N2 + 3 K2O  3 MgO + 2 K3N
3. If 14 moles of potassium oxide reacts with an excess amount of magnesium nitride, how many
grams of potassium nitride will be made?
A
B
Given: 14 grams K2O = ? g K3N
Conversions: Molar mass of K2O: 1 mole K2O = 94 g K2O
Mole to mole ratio: 3 moles K2O = 2 moles K3N
Molar mass K3N: 1 mole K3N = 131 g K3N
Setup:
14 grams K2O X 1 mole K2O X 2 moles K3N X 131 g K3N = 13 g K3N
94 g K2O
3 moles K2O
1 mole K3N
4. How many grams of magnesium nitride is needed to react with an excess amount of potassium
oxide to produce 11.6 grams of magnesium oxide?
A
B
Given: 11.6 grams MgO = ? g Mg3N2
Conversions: Molar mass of MgO: 1 mole MgO = 40 g MgO
Mole to mole ratio: 3 moles MgO = 1 mole Mg3N2
Molar mass Mg3N2: 1 mole Mg3N2 = 100 g Mg3N2
Setup:
11.6 grams MgO X 1 mole MgO
40 g MgO
X
1 mole Mg3N2
3 moles MgO
X 100 g Mg3N2 = 9.7 g Mg3N2
1 mole Mg3N2
Use the following to answer questions 5 - 8.
C3H8 + 5 O2  4 H2O + 3 CO2
5. 32 grams of propane (C3H8) is burned in excess oxygen gas to produce how many grams of
water?
A
B
Given: 32 g C3H8 = ? g H2O
Conversions: Molar mass C3H8 : 1 mole C3H8 = 44 g C3H8
Mole to Mole ratio: 1 mole C3H8 = 4 moles H2O
Molar mass H2O : 1 mole H2O = 18 g H2O
Setup:
32 g C3H8
X 1 mole C3H8
44 g C3H8
X
4 moles H2O X
1 mole C3H8
18 g H2O = 52.4 g H2O
1 mole H2O
6. How many grams of oxygen gas is needed to make 30 grams of carbon dioxide?
A
B
Given: 30 g CO2 = ? g O2
Conversions: Molar mass CO2 : 1 mole CO2 = 44 g CO2
Mole to mole ratio: 3 moles CO2 = 5 moles O2
Molar mass of O2 : 1 mole O2 = 32 g O2
Setup:
30 g CO2 X 1 mole CO2 X 5 moles O2 X 32 g O2 = 36.4 g O2
44 g CO2
3 moles CO2 1 mole O2
7. If 0.45 grams of water is formed during the combustion of propane, how many grams of
carbon dioxide is formed?
A
B
Given: 0.45 g H2O = ? grams CO2
Conversions: Molar mass of H2O: 1 mole H2O = 18 g H2O
Mole to mole ratio: 4 moles H2O = 3 moles CO2
Molar mass of CO2 : 1 mole CO2 = 44 g CO2
Setup:
0.45 g H2O X 1 mole H2O X 3 moles CO2 X 44 g CO2 = .825 g CO2
18 g H2O
4 moles H2O
1 mole CO2
8. How many grams of propane, C3H8, are needed to make 140 grams of water?
A
B
Given: 140 g H2O = ? g C3H8
Conversions: Molar mass H2O: 1 mole H2O = 18 g H2O
Mole to mole ratio: 4 moles H2O = 1 mole C3H8
Molar mass C3H8 : 1 mole C3H8 = 44 g C3H8
Setup:
140 g H2O X 1 mole H2O X 1 mole C3H8 X 44 g C3H8 = 85.4 g C3H8
18 g H2O
4 moles H2O
1 mole C3H8