Name:_______________________________
Date:_____________
1. Consider the reaction
2H2(g) + O2(g)  2H2O(g)
Identify the limiting reagent in each of the reaction mixtures below:
A. 50 molecules of H2 and 25 molecules of O2
B. 100 molecules of H2 and 40 molecules of O2
C. 100 molecules of H2 and 100 molecules of O2
D. 0.50 mol H2 and 0.75 mol O2
E. 0.80 mol H2 and 0.75 mol O2
F. 1.0 g H2 and 0.25 mol O2
2. When a mixture of hydrogen and oxygen is combined, water is formed:
H2(g) +
O2(g) 
H2O(g)
A. What mass of H2O is produced from a mixture of 6.0 g of H2 and 10.0 g O2?
B. What mass of which reactant is left unreacted?
3. Iron combines with oxygen, producing rust:
Fe(s) + O2(g)  Fe2O3(s)
In a certain experiment, 6.0 g IRON was reacted with an excess of oxygen. If the percent
yield was 75.0%, what was the actual yield?