Question

The percentage composition of carbon by mole in methane is :

• A. 80%
• B. 25%
• C. 75%
• D. 20%

Answer 1

Answer: (D)

In $C{H}_4$
Mole of carbon $n_C=1$
Mole of hydrogen $=n_H=4$
$\%$ of $n_C=\frac{n_C}{{}_{n_C}{+}_{n_H}}\times 100=\frac{1}{5}\times 100=20\%$