6 chemistry assignments due in 3 days

Name: ____________________________________ Date ___________ Class Period _____

Limiting Reagents and Percent Yield Problems

Show all of the problem-solving steps, as demonstrated in the video lesson (link), for full credit
on this assignment. (Final answers are at the end).

1. In an experiment, 3.25 g of NH3 reacts with 3.50 g of O2

NH3 + O2 → NO + H2O (Balance the equation first)

a. Which reactant is the limiting reagent?

b. How many grams of NO are formed?

c. How much of the excess reactant remains after the reaction?

2. If 4.95 g of ethylene (C2H4) are combusted with 3.25 g of oxygen. (Look back at reaction
types notes and the format of a combustion reaction Then, write a a balanced equation.)

a. Balanced equation:

b. What is the limiting reagent?

c. How many grams of CO2 are formed?

Name: ____________________________________ Date ___________ Class Period _____

3. Consider the following reaction:

C6H6 + Br2 → C6H5Br + HBr (Balance this equation first)

a. What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0 g of Br2?

b. If the actual yield of C6H5Br is 63.6 g, what is the percent yield?

Answers:
1) In an experiment, 3.25 g of NH3 are allowed to react with 3.50 g of O2.

NH3 + O2 → NO + H2O (unbalanced equation)

a. Which reactant is the limiting reagent? O2
b. How many grams of NO are formed? 2.63 g NO
c. How much of the excess reactant remains after the reaction? 1.76 g NH3 left

2) If 4.95 g of ethylene (C2H4) are combusted with 3.25 g of oxygen.
a. What is the limiting reagent? O2
b. How many grams of CO2 are formed? 2.98 g CO2

3) Consider the reaction of C6H6 + Br2 C6H5Br + HBr
a. What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0 g of Br2? 71.6 g
C6H5Br
b. If the actual yield of C6H5Br is 63.6 g, what is the percent yield? 88.8%