CHEM 1405 - CHAPTER 9
CHEMICAL EQUATION CALCULATIONS
PRACTICE PROBLEMS
1. Find the mole, molecule, mass, and volume relationship in the following equation
4NH3 + 5O2
4NO + 6H2O
2. The complete combustion of octane, C8H18, a component of gasoline, proceeds as
Follows:
2 C8H18 + 25 O2  16 CO2 + 18 H2O
a) How many moles of CO2 are produced when 1.50-mol octane reacted?
b) How many grams water produced in this reaction?
c) How many moles oxygen required forming 90.0 g water?
3. In a certain experiment 2.50 g of NH3 reacts with 2.85 g of O2. Which reactant is
the limiting reactant? How many grams of NO are formed? How much excess
reactant remains after the liming reactant is completely consumed?
4. Given 30.0 g benzene and 65.0 g bromine in the following reaction:
C6H6 + Br2  C6H5Br + HBr
If the actual yield of C6H5Br, bromobenzene, is 56.7 g, what is the percentage
yield?