PDF Stoichiometry Worksheet 2 (Percent Yield)

STOICHIOMETRY WORKSHEET 2 (PERCENT YIELD)

Complete the following on SEPARATE paper showing all work. 1. Sodium carbonate reacts with nitric acid according to the following balanced

equation: DELETED BY MR W -- FILL THIS IN YOURSELF

a. If 30 grams of sodium carbonate react with excess nitric acid, how many grams of sodium nitrate should be produced?

b. If the final mass of sodium nitrate is 45.5 grams, what is the percent yield? What is the percent error?

2. Iron reacts with oxygen to form iron (III) oxide (rust) according to the following unbalanced equation: DELETED BY MR W -- WRITE THE EQUATION

a. Balance the chemical equation. b. If 100 grams of iron react with excess oxygen, how much rust should be

produced? c. If the actual mass of iron (III) oxide at the end of the experiment is 130

grams, what is the percent yield? 3. 200 grams of zinc react with copper sulfate solution according to the following

balanced equation Zn (s) + CuSO4 (aq) Cu (s) + ZnSO4 (aq)

a. Calculate the number of grams of copper sulfate that react. b. Calculate the number of grams of copper that should be produced. c. If 150 grams of copper is collected at the end of the experiment, what is

the percent yield?

Answers: 1a) 48.1 grams 1b) 94.6% yield, 5.4% error 2b) 142.9 grams 2c) 91.0% yield, 9.0% error) 3a) 488 g CuSO4 3b) 194 grams 3c) 77.3% yield, 22.7% error.

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