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Chapter 3 Assignment – The Mole & Stoichiometry
Name:
Section 1: Stoichiometry
1. Complete and balance the combustion reaction below:
_____ C2H6 (g) + _____ O2 (g) →
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a. If you had 12.0 mol of O2, how many grams of CO2 would be produced?
b. If you had 150 grams of C2H6, how many grams of H2O would be produced?
c. If you started with 75.0 g of O2, how many grams of C2H6 would it react with?
d. If you started with 1.5 x 1025 molecules of O2, how many moles of H2O would form?
e. If you started with 100.0 L of O2, what volume (in L) of CO2 would be produced?
f. Suppose you started with 22.5 mL of C2H6 and 150.0 mL of O2. Do you have too much O2
for a complete reaction or too little O2?
3. Sodium chloride is decomposed into the elements sodium and chlorine by means of electrical
energy. How many litres of chlorine gas can be obtained from 2.50 mol NaCl?
Section 2: Limiting Reactants
1. If 50.0 g of zinc is reacted with 50.0 g of sulfuric acid according to the following reaction:
_____ Zn + _____ H2SO4 →
a. What is the limiting reactant?
b. What reactant is in excess? How much excess reactant is there?
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2. If 100.0 g of NaCl is combined with 100.0 g AgNO3 according to the following reaction:
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_____ NaCl + _____ AgNO3 →
a. What is the limiting reactant?
b. What reactant is in excess? How much excess reactant is there?
c. What mass of silver chloride would be produced?
d. What mass of sodium nitrate would be produced?
Section 3: Percent Yield
1. What is the percent yield of the following reaction if 20.0 g of lithium hydroxide was added to
an excess of potassium chloride to give 6.1 g of lithium chloride?
LiOH + KCl → LiCl + KOH
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2. Lithium and nitrogen react to produce lithium nitride. If 5.00 g of each reactant undergoes a
reaction with an 88.5% yield, how many grams of lithium nitride are obtained from the
reaction?
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