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Ethanol C2H5OH has a molar mass of 46.068 g. What is its carbon mass percent?
A52.14%
B13.13%
C65.20%
D34.73%
Answer & Solution
Correct answer: A. 52.14%
Two carbons weigh 24.02 g, and 24.02 / 46.068 x 100 = 52.14 percent.
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