Chemistry Stoichiometry Study Guide

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Question 1 (2.7 points) The combustion of butane, C4H10(g), produces carbon dioxide and water vapor. In the balanced equation for this reaction, what are the coefficients of butane, oxygen, carbon dioxide, and water, respectively?
Question 1 options:

2, 13, 4, 10

1, 6, 4, 5

1, 6, 8, 10

1, 13, 4, 5

2, 13, 8, 10
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Question 2 (2.7 points) When aluminum metal is dissolved in perchloric acid, aluminum(III) perchlorate and hydrogen gas are formed. In the balanced equation for this reaction, what is the coefficient of hydrogen gas?
Question 2 options:

3

2

1

4

5
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Question 3 (2.7 points) The coefficients of calcium hydroxide and hydrogen, respectively, in the balanced equation for the reaction of calcium with water are
Question 3 options:

1 and 3.

1 and 2.

1 and 1.

2 and 1.

2 and 2.
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Question 4 (2.7 points) Lithium has two naturally occurring isotopes, Li-6 and Li-7, with natural abundance of 7.42% and 92.58%, respectively. What is the average molar mass of lithium?
Question 4 options:

7.016 g/mol

5.982 g/mol

6.015 g/mol

6.941 g/mol

6.515 g/mol
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Question 5 (2.7 points) If the molar mass of chlorine gas, Cl2, is 70.9 g/mol, what mass of chlorine gas contains 0.652 moles of chlorine gas?
Question 5 options:

109 g

92.4 g

46.2 g

23.1 g

9.20 g
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Question 6 (2.7 points) What is the molar mass of dinitrogen pentoxide?
Question 6 options:

108 g/mol

30 g/mol

150 g/mol

94 g/mol

44 g/mol
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Question 7 (2.7 points) How many nitrogen atoms are present in 3.00 × 10–3 moles of nitrogen gas, N2?
Question 7 options:

1.81 × 1019

3.61 × 1019

1.20 × 1021

1.81 × 1021

3.61 × 1021
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Question 8 (2.7 points) A sample of water has a mass of 50.0 g.