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Chemical Formulae

The percentag...

Question

The percentage by weight of carbon in ethane is:

A

85.7 %

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B

92.3 %

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C

80 %

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D

50 %

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Solution

The correct option is C $80 %$
Atomic weight of carbon $= 12 u$
Atomic weight of hydrogen $= 1 u$
Molecular wight of ethane $C_{2} H_{6}$ $= 30 u$
wight percentage of carbon in ethane
$= \frac{24}{30} \times 100 = 80 %$

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