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  4. The percentage composition of carbon by mole in methane is :

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Q. The percentage composition of carbon by mole in methane is :

JEE MainJEE Main 2019Some Basic Concepts of Chemistry

Solution:

In $CH_4$
Mole of carbon $n_C = 1$
Mole of hydrogen $= n_H = 4$
$\%$ of $n_{C} = \frac{n_{C}}{_{n_C} +_{n_H}}\times100 = \frac{1}{5} \times 100 = 20\%$