Homework Set 9-3: Percent Yield
1.
Use the equation below to answer the following question.
BaCl 2 + Na2SO4 (aq) → 2NaCl(aq) + BaSO 4 (s)
The theoretical yield of BaSO4 is 58.35 g. If 44.34 g of BaSO4 are produced from the reaction
shown above, what is the percent yield of BaSO4?
2. For the reaction:
2 NaCl (aq) + Pb(NO3)2 (aq)
 2 NaNO3 (aq) + PbCl2 (s)
(a) How many grams of PbCl2 can be formed from 32.5 g NaCl?
(b) If 62.6 g of PbCl2 were actually collected in the reaction, then what is the percent yield for the reaction?
3. Iron reacts with oxygen to form iron (III) oxide (rust) according to the following unbalanced equation:
Fe (s) + O2 (g)  Fe2O3 (s)
(a) Write the balance chemical equation.
(b) If 10.0 grams of iron react with oxygen, how many grams of iron (III) oxide (rust) should be produced?
(c) If the actual mass of iron (III) oxide at the end of the experiment is 13.0 grams, what is the percent yield?
4. Coal gasification is a process that converts coal into methane (CH4) gas. If this reaction has a percent yield of
85.0%, what mass of methane can be obtained from 1250 g of carbon?
2 C (s) + 2 H2O (l)  CH4 (g) + CO2 (g)