Question

The mass ratio of carbon to hydrogen in methane is 3:1. How much amount of hydrogen is required to react with 36 g of carbon to form methane?

• A. 10 gm
• B. 12 gm
• C. 16 gm
• D. 30 gm

Answer 1

The correct option is B

12 gm

The chemical formula of methane is $C{H}_4$. The carbon to hydrogen mass ratio in it is $3:1$.
3 g of carbon requires one gram of hydrogen.
So, 36 g of carbon requires
=$\frac{36}{3}\times 1=12\text{g}$ of hydrogen