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

Your response

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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

Your response

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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

Your response

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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

Your response

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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

Your response

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