Question

Equal masses of methane and hydrogen are mixed in an empty container at ${25}^{o}C$. The fraction of the total pressure exerted by hydrogen is:

• A. $\frac{1}{2}$
• B. $\frac{8}{9}$
• C. $\frac{1}{9}$
• D. $\frac{16}{17}$

Answer 1

The correct option is B $\frac{8}{9}$

Let mass of $C{H}_4$ & be m gm

[B]

mole of fraction of $H_2$ $=\frac{m}{\frac{2}{\frac{m}{2}+\frac{m}{16}}}=\frac{8m}{9m}=\frac{8}{9}$

So, the correct answer is $\frac{8}{9}$.