What is the mass per cent of oxygen in ethanol?

52.14 %

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13.13 %

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16 %

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34.73 %

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Solution

The correct option is B $34.73 %$
Ethanol is $C_{2} H_{6} O$
molar mass of ethanol =46 g
Mass % of oxygen = $100 \times \frac{(m a s s o f o x y g e n i n t h e m o l e c u l e)}{(m o l a r m a s s o f m o l e c u l e)}$
$∴$ m% of oxygen $= 100 \times (16 / 46) = 34.78$ %
Hence, option $D$ is correct.

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