Your Name:

Homework: Limiting Reagent
and Percent Yield

Show work for all calculations. You will need a calculator and a periodic table to complete them. You may also use your ions reference sheet.

  1. A manufacturer of bicycles has 4,815 wheels, 2,305 frames, and 2,225 handlebars.
    1. How many bicycles can be manufactured using these parts?
    2. How many parts of each kind are left over?
    3. Which part limits the production of bicycles?
  2. Identify the limiting reagent when 5.87 g of magnesium hydroxide reacts with 12.84 g of hydrogen chloride to form magnesium chloride and water. What is the theoretical yield of magnesium chloride in grams?
  3. Identify the limiting reagent when 11.2 g of calcium metal reacts with 12.1 g of iron(III) chloride to form calcium chloride and iron metal. What is the theoretical yield of iron metal in grams?
  4. Sodium hydroxide reacts with carbon dioxide to make sodium carbonate and water. Which reagent is limiting when 1.85 mol sodium hydroxide and 1.00 mol carbon dioxide are allowed to react? How many moles of sodium carbonate are produced? How many moles of the excess reagent remain after the reaction is complete?

page break
  1. Aluminum hydroxide reacts with sulfuric acid to make aluminum sulfate and water. Which reagent is limiting when 0.575 mol aluminum hydroxide are placed in a solution containing 0.500 mol sulfuric acid? How many moles of aluminum sulfate form under these conditions? How many moles of the excess reagent remain after the reaction is complete?
  2. Benzene (C6H6) reacts with elemental bromine to make bromobenzene (C6H5Br) and hydrobromic acid (HBr). What is the theoretical yield of bromobenzene in this reaction when 30.0 g of benzene reacts with 65.0 g of bromine? If the actual yield of bromobenzene was 42.3 g, what was the percentage yield?
  3. Hydrogen sulfide is an impurity in natural gas that must be removed. One common removal method is called the Claus process, which relies on a reaction in which the hydrogen sulfide reacts with oxygen to make elemental sulfur (S8) and water. When conditions are exactly right the Claus process has an efficiency of 98%. That is, the yield of elemental sulfur is 98% of the theoretical yield. If you started with 3.00 g of hydrogen sulfide and 50.0 g of oxygen, how many grams of elemental sulfur would be produced?
  4. Zinc and hydrochloric acid react to form hydrogen gas and zinc chloride. What is the percent yield if 5.79 g of hydrogen gas are produced by the reaction of 236 g hydrochloric acid with 257 g zinc?
This homework belongs with the Limiting Reagent Group Activity.
It is related to the original Stoichiometry Activity and Stoichiometry Homework.
See also some additional problems for Stoichiometry.
Credit for some problem set-ups is due to Nathan Guerin.
Last updated: May 18, 2011       Home