Question

Equal weights of methane and hydrogen are mixed in an empty container at ${25}^{o}C$. The fraction of total pressure exerted by hydrogen is ........$x/9$.
so value of $x$ is :

Answer 1

as we know,
$P_{n_2}\propto n_{H_2}$
$P_{total}\propto (n_{H_2}+n_{C{H}_4})$
$\frac{P_{H_2}}{P_{total}}=\frac{w/2}{w/2+w/16}\Rightarrow \frac{8}{9}$