Name:_________________________
Stoichiometry Sheet 1
Mass / Mole Relationships
To convert mass to moles we use the mass of
one mole.
g of A 1 mole of A
×
=moles of A
molar mass of A
To convert moles to mass we use the mass of
one mole.
moles of B molar mass of B
×
=g of B
1 mole of B
For example: How many moles of ethane (C2H6)
are in 400 g of ethane? Because we know that
there are 30.07 g of ethane in one mole:
400 g of C 2 H6 1 mole C 2 H6
×
=13.3 moles C2 H6
30.07 g C2 H6
For example: How many grams of ethane are in
13.3 moles of ethane? Because we know that
there are 30.07 g of ethane in one mole:
13.3 moles C2 H6 30.07 g C 2 H6
×
=400 g of C2 H6
1 mole C 2 H6
1.
Please perform the following conversions. Of course you should show all of your work:
2.5 moles of KCN to grams:
2.
2.5 grams of KCN to moles:
3.
4 g of water to moles:
4.
100 g of CuSO4·5H2O to moles:
5.
2.3 moles of H2SO4 to grams:
6.
How many moles of water are there in one liter?
© John B. Chesnut 2007 - 2008
http://www.mrchesnut.com/resources/stoichiometry_handout.pdf
Name:_________________________
Stoichiometry Sheet 2
Mole / Mole Relationships
To convert moles of one substance to moles of another we use a ratio obtained
from a balanced chemical equation.
moles of A moles of B
×
=moles of B
moles of A
For Example: Suppose we wanted to determine how many moles of oxygen would
be needed to completely react with 13.3 moles of C2H6:
2C2H6 + 7O2 → 4CO2 + 6H2O
13.3 moles C2 H6
×
7 moles O 2
2 moles C2 H6
=26.6 moles O2
Please answer the following questions. Of course you should show all of your work:
1.
For the reaction C + 2H2 → CH4, how many moles of hydrogen are required to produce 10 moles
of methane, CH4?
2.
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3)2 + 2H2O, how many moles of magnesium nitrate
are produced from 8.00 moles of nitric acid, HNO3?
3.
For the reaction CH4 + 2O2 → CO2 + 2H2O, how many moles of water are produced from the
combustion of 12.5moles of methane?
4.
For the reaction Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced
from 4.3 moles of chlorine?
5.
For the reaction 2Zn + O2 → 2ZnO, how many moles of zinc oxide can be produced from 2.7.
moles of oxygen?
© John B. Chesnut 2007 - 2008
http://www.mrchesnut.com/resources/stoichiometry_handout.pdf
Name:_________________________
6.
Stoichiometry Sheet 3
Mole to Gram Problems
For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 0.6
moles of methane, CH4?
7.
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate
are produced from 8.00 moles of water?
8.
For the reaction CH4 + 2O2 → CO2 + 2H2O, how many grams of water are produced from the
combustion of 6.35 moles of methane?
9.
For the reaction Cl2 + 2KBr → 2KCl + Br2, how many grams of potassium chloride are produced
from 4.3 moles of potassium bromide?
10.
For the reaction 2Zn + O2 → 2ZnO, how many grams of zinc oxide can be produced from 7.3
moles of oxygen?
© John B. Chesnut 2007 - 2008
http://www.mrchesnut.com/resources/stoichiometry_handout.pdf
Name:_________________________
11.
Stoichiometry Sheet 4
Gram to Mole Problems
For the reaction C + 2H2 → CH4, how many moles of hydrogen are required to produce 14
grams of methane, CH4?
12.
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3)2 + 2H2O, how many moles of magnesium nitrate
are produced from 143.2 grams of nitric acid, HNO3?
13.
For the reaction CH4 + 2O2 → CO2 + 2H2O, how many moles of water are produced from the
combustion of 45.2 g of methane?
14.
For the reaction Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced
from 11.3 g of chlorine?
15.
For the reaction 2Zn + O2 → 2ZnO, how many moles of zinc oxide can be produced from 275 g
of oxygen?
© John B. Chesnut 2007 - 2008
http://www.mrchesnut.com/resources/stoichiometry_handout.pdf
Name:_________________________
Stoichiometry Sheet 5
Gram to Gram Problems
16.
For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 145
grams of methane, CH4?
17.
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate
are produced from 981 grams of nitric acid, HNO3?
18.
For the reaction CH4 + 2O2 → CO2 + 2H2O, how many grams of water are produced from the
combustion of 42.0 g of methane?
19.
For the reaction Cl2 + 2KBr → 2KCl + Br2, how many grams of potassium chloride are produced
from 113 g of chlorine?
20.
For the reaction 2Zn + O2 → 2ZnO, how many grams of zinc oxide can be produced from 2.75 g
of oxygen?
© John B. Chesnut 2007 - 2008
http://www.mrchesnut.com/resources/stoichiometry_handout.pdf
Name:_________________________
Stoichiometry Sheet 6
Please answer the following questions about the combustion of acetylene:
2C2H2 + 5O2 → 4CO2 + 2H2O
1. How many moles of acetylene (C2H2) are needed to completely react with 12 moles of oxygen?
2. How many grams of carbon dioxide are produced from the combustion of 1.3 moles of acetylene
(C2H2)?
3. How many moles of carbon dioxide are produced from 148 g of acetylene (C2H2)?
4. How many grams of water are produced from 100 grams of oxygen?
5. How many grams of water are produced from 100 grams of acetylene (C2H2)?
6. Given your answers to problems 4 and 5 how many grams of water are produced from 100 g each
of oxygen and acetylene (C2H2)?
© John B. Chesnut 2007 - 2008
http://www.mrchesnut.com/resources/stoichiometry_handout.pdf
Name:_________________________
Stoichiometry Sheet 7
Please answer the following multiple choice questions:
_____1. For the reaction SO3 + H2O → H2SO4, how many grams of sulfur trioxide are required to
produce 4.00 mol of sulfuric acid?
a. 80.0 g
b. 160. g
c. 240. g
d. 320. g
_____2. For the reaction 2Fe + O2 → 2FeO, how many grams of iron oxide are produced from 8.00 mol
of iron?
a. 71.8 g
b. 574 g
c. 712 g
d. 1310 g
_____3. For the reaction 2Na + Cl2 → 2NaCl, how many grams of chlorine gas are required to react
completely with 2.00 mol of sodium?
a. 35.5 g
b. 70.9 g
c. 141.8 g
d. 212.7 g
_____4. For the reaction Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of lead iodide are produced
from 300. g of potassium iodide?
a. 0.903 mol
b. 1.81 mol
c. 3.61 mol
d. 1.00 mol
_____5. For the reaction 2KlO3 → 2KCl + 3O2, how many moles of potassium chlorate are required to
produce 250 g of oxygen?
a. 2.0 mol
b. 4.3 mol
c. 4.9 mol
d. 5.2 mol
_____6. For the reaction 2Zn + O2 → 2ZnO, how many grams of zinc oxide can be produced from 100.
g each of zinc and oxygen?
a. 100. g
b. 124 g
c. 189 g
d. 200. g
_____7. For the reaction Cl2 + 2KBr → 2KCl + Br2, calculate the percent yield if 200. g of chlorine react
with excess potassium bromide to produce 410. g of bromine.
a. 73.4%
b. 82.1%
c. 91.0%
d. 98.9%
© John B. Chesnut 2007 - 2008
http://www.mrchesnut.com/resources/stoichiometry_handout.pdf