Question

What is the percentage of carbon, hydrogen and oxygen in ethanol?

Solution

Molecular formula of ethanol is C₂H₅OH.
Molar mass of ethanol (C₂H₅OH)
= 2(12.01) +6(1.008) +16.00 = 46.068g
Mass percentage of carbon
=

fraction numerator 24.02 space straight g over denominator 46.068 space straight g end fraction cross times space 100 space equals space 52.14 percent sign

Mass percentage of hydrogen

equals space fraction numerator 6.048 straight g over denominator 46.068 straight g end fraction cross times space 100 space equals space 13.13 percent sign

Mass percentage of oxygen

equals space fraction numerator 16.00 space straight g over denominator 46.068 space straight g end fraction cross times space 100 equals space 34.73 percent sign

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