Stoichiometry Sample Problems
Name _____________________________________
1.
How many moles of oxygen are required to react with 16 moles of hydrogen in the production of water?
2.
Antimony reacts with water to produce antimony(III) oxide and hydrogen. How many grams of hydrogen are produced from 7.5
moles of antimony?
3.
What mass of aluminum oxide can be prepared by the reaction of 67.5 g of aluminum in a synthesis reaction?
4.
Sodium bicarbonate, a.k.a. baking soda, can be used to extinguish a fire. When heated, it decomposes to give carbon dioxide gas
which smothers the fire. It also produces sodium carbonate and water. If a sample contains 4.0 g of sodium bicarbonate, how
many mL of carbon dioxide is produced at STP? How many molecules of water are produced?
5.
A reaction between 2.80 g aluminum nitrate and excess sodium hydroxide produced 0.966 g of aluminum hydroxide in this
double replacement reaction. Calculate the % yield.
6.
Determine the percent yield for the reaction between 6.92 g of potassium and excess oxygen if 7.36 g of potassium oxide is
produced.
7.
What mass of CO2 could be formed by the combustion of 16.0 g CH 4 with 48.0 g O2?
8.
What is the maximum mass of nickel(II) hydroxide that could be prepared by mixing 25.9 g nickel(II) chloride with 10.0 g
sodium hydroxide?
9.
Using Hess’s Law, calculate the H for the following reaction: CuCl2 + Cu →
Given: Cu + Cl2 → CuCl2
2Cu + Cl2 → 2CuCl
2CuCl
ΔH = -206 kJ
ΔH = -136 kJ
10. Using Hess’s Law, calculate the H for the following reaction: C + O2 → CO2
Given: C + ½ O2 → CO
CO + ½ O2 → CO2
ΔH = -110.5 kJ
ΔH = -283.0 kJ
11. How much heat is released when 22.0g of propane is burned?
C3H8 + 5O2 → 3CO2 + 4H2O
ΔH = -2.22x103 kJ
a.
How much carbon dioxide is produced, in grams, when 2,500 kJ of energy is released?
12. Using the Heats of Formation Table, calculate the H for the following reaction:
SF6(g) + 3H2O(l)  6HF(g) + SO3(g)
13. Using the Heats of Formation Table, calculate the standard heat of combustion for propane. Write the thermonuclear equation.
C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(g)