Stoichiometry Review Problems
Name:
Period:
Date:
Solve the following problems, using the structure shown in class. Circle your answer.
1. N2 + 3H2  2NH3
How many moles of hydrogen are needed to make 312 moles of ammonia, NH3?
2. Fe2O3 + 2Al  2Fe + Al2O3
How many grams of Al are needed to completely react with 135 grams of Fe2O3?
3. 3CaCO3 + 2H3PO4  Ca3(PO4)2 + 3H2O + 3CO2
What mass in grams of H2O is produced if 65.2 g CaCO3 reacts with excess H3PO4?
4. 2KClO3  2KCl + 3O2
What mass of O2 can be made from heating 125 grams of KClO3?
5. LiOH + HBr  LiBr + H2O
If you start with 10.0 grams of lithium hydroxide, how many grams of lithium
bromide will be produced?
6. KO2 is used in a closed-system breathing apparatus. It removes carbon dioxide
and water from exhaled air. The reaction for the removal of water is:
KO2 + H2O
O2 + KOH
The KOH produced is used to remove carbon dioxide by the following reaction:
KOH + CO2
KHCO3. What mass of KO2 produces 235 g of O2?
7. From the following reaction:
B2H6 + O2
HBO2 + H2O
what mass of O2 will be needed to burn 36.1 g of B2H6?
8. One mole of aspartame (C14H18N2O5) reacts with two moles of water to produce
one mole of aspartic acid (C4H7NO4), one mole of methanol (CH3OH) and one mole
of phenylalanine (C9H11NO2).
a. Write the balanced equation.
b. What mass of phenylalanine is produced from 378 g of aspartame?