Review Sheet – Chemistry – Ch
Review Sheet – Chemistry, CCP – Ch. 12: Stoichiometry
Name: ______ANSWER______________ Date:___________ Period:___
This test covers materials in the textbook in Chapter 12 (p. 352-377). You are always responsible for the topics on the previous tests.
Test Expectations
The student should be able:
• Perform stoichiometry calculations starting with known quantities of moles, mass or volume and finding volume, mass, and moles using the information provided by a balanced chemical equation, including limiting reactant situations.
• Determine the limiting reactant of chemical reaction.
• Calculate percent yield of a chemical reaction given measured yields.
• Use stoichiometry calculations to show that chemical reactions obey the Law of Conservation of Matter (Mass).
1. Define each of the following terms clearly and completely.
a) stoichiometry –
b) limiting reagent/reactant –
c) nonstoichiometric proportions –
d) conservation of mass –
e) percent yield –
f) excess –
2. How many moles of water can be formed when 4.22 moles of ethane (C2H6) burn?
2 C2H6 + 7 O2 ( 4 CO2 + 6 H2O (moles-moles problem)
4.22 mol ? mol
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3. How many liters of carbon dioxide at STP can be produced by decomposing 47.4 grams of calcium carbonate?
CaCO3 ( CaO + CO2 (mass-volume problem)
47.4 g ? L
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4. How many liters of hydrogen are needed to react with 8.0 liters of nitrogen to produce ammonia (NH3)?
3 H2 + N2 ( 2 NH3 (volume-volume problem)
? L 8.0 L
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5. How many grams of copper(II) hydroxide are needed to form 100 grams of copper(II) oxide?
Cu(OH)2 ( CuO + H2O (mass-mass problem)
? g 100 g
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6. How many grams of NaCl can be formed if 24.8 grams of Na are allowed to react with 35.0 grams of Cl2?
2 Na + Cl2 ( 2 NaCl (limiting reactant problem)
24.8 g 35.0 g ? g
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Pick the smallest, which is 57.8 grams.
7. The theoretical yield of a reaction was 3.74 grams of NaCl. One lab group obtained 3.57 grams NaCl. What was their percent yield?
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8. What is the theoretical yield if 15.0 grams of Zn are reacted with 31.9 grams of HCl and 10.6 grams of ZnCl2 are recovered?
Zn + 2 HCl ( ZnCl2 + H2 (limiting reactant/percent yield)
15.0 g 31.9 g ? g
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