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  4. What is the mass per cent of oxygen in ethanol?

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Q. What is the mass per cent of oxygen in ethanol?

Some Basic Concepts of Chemistry

Solution:

Molecular formula of ethanol $= C_{2}H_{5}OH$
Molar mass of ethanol $= 2 \times 12.01 + 6 \times 1.008 + 16$
$ = 46.068\, g$
Mass per cent of oxygen $=\frac{16}{46.068} \times 100$
$ = 34.73\%$