Question

Equal weight of methane and hydrogen are mixed in an empty container at ${25}^{0}C$. The fraction of total pressure exerted by hydrogen is?

• A. 1/2
• B. 8/9
• C. 16/19
• D. 1/9

Answer 1

The correct option is B 8/9

Molar ratio of $C{H}_4$ : $H_2$ = 16 : 2 = 8 : 1 (Mixed in equal quantities)

Pressure is directly proportional to number of moles.

Methane is 8/9 of total number of moles.

So,

Fraction of pressure by $C{H}_4$ = 8/9

Therefore B is the correct option.