Stoichiometry Worksheet– Limiting/Excess Problems
Stoichiometry Worksheet– Limiting/Excess Problems
Do these problems on a separate piece of paper. Show all work.
1. Sodium chloride can be prepared by the reaction of sodium metal and chlorine gas.
If 6.70 moles of Na react with 3.20 moles of Cl2,
a. What is the limiting reactant? Cl2
b. How many moles of NaCl are produced? 6.40 moles NaCl
c. How much of the excess reactant remains unreacted? .30 moles Na
2. Hydrogen gas can be produced in the laboratory by the reaction of magnesium metal with hydrochloric acid.
How many grams of hydrogen can be produced when 6.00 g of HCl is added to 5.00 g of Mg?
.164 g H2
3. Calcium carbonate is decomposed by heating to form calcium oxide and carbon dioxide gas.
What is the percent yield of this reaction if 24.8 g of CaCO3 is heated to give 13.1 g of CaO?
94.2% yield
4. If 19 g of zinc are reacted with 19 g magnesium chloride, zinc chloride and magnesium are formed.
a. Which reactant will be in excess? Zn
b. Calculate the mass of the zinc chloride produced. 27 g ZnCl2
c. Calculate the mass of the excess reactant that remains unreacted. 6 g Zn remains
5. Nitrogen gas can be prepared by passing gaseous ammonia over solid copper (II) oxide at high temperatures. The other products of the reaction are solid copper and water vapor.
If a sample containing 18.1 g of NH3 is reacted with 90.4 g of CuO,
a. Which is the limiting reactant? CuO
b. How many grams of N2 will be formed? 10.6 g N2
c. If only 8.2 grams N2 are actually formed during the experiment, what is the percent yield?
77% yield
6. Methanol (CH3OH), also called methyl alcohol, is the simplest alcohol. It is used as a fuel in race cars and is a potential replacement for gasoline. Methanol can be manufactured by reacting gaseous carbon monoxide with hydrogen gas. Suppose 68.5 kg CO is reacted with 8.60 kg H2,
a. Calculate the theoretical yield of methanol. 6.88 x 104 g
b. If 3.57 x 104 g CH3OH is actually produced, what is the percent yield of methanol?
51.9% yield
7. Zinc and HCl react to form ZnCl2 and hydrogen gas. How many grams of H2 can be produced if 4.25g of Zinc react with 25 mL of 3.00M HCl? 0.075 g H2
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