3-4: Mass Percents of Atoms
Chapter 3
West Virginia University
Dr. Robert Belford & Rebekah Reinhart




Question 1
Calculate the mass percent composition of calcium in calcium chloride.
(A)  50.0%
(B)  36.1%
(C)  33.0%
(D)  None of the above
 
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Question 2
What is the mass percent composition of sodium in sodium chloride?
(A)  39.3%
(B)  51.0%
(C)  46.5%
(D)  None of the above
 
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Question 3
Given the organic molecule, C6H12O6, calculate the mass percent oxygen in the molecule.
(A)  6.7%
(B)  40.0%
(C)  53.3%
(D)  None of the above
 
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Question 4
What is the mass percent of carbon in methane, CH4
(A)  74.9%
(B)  20.0%
(C)  25.1%
(D)  None of the above
 
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Question 5
Calculate the mass percent sulfur in Cu2S.
(A)  50.0%
(B)  20.1%
(C)  33.3%
(D)  None of the above
 
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