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Q. Mass $\%$ of carbon in ethanol is

NTA AbhyasNTA Abhyas 2020Some Basic Concepts of Chemistry

Solution:

Ethanol is $C _{2} H _{5} OH$
Molecular mass $=12 \times 2+6 \times 1+16 \times 1$
$=24+6+16=46$
Mass of carbon in ethanol $=12 \times 2=24$
Mass $ \%$ of carbon $=\frac{\text { Mass of carbon }}{\text { Molar mass of compound }}\times 100$
$=\frac{24}{46} \times 100=52 \%$