Equal weights of $CH_4$ and $O_2$ are mixed in an empty container of one litre at $27^{\large\circ}C$. Calculate the fraction of total pressure exerted by $O_2$.

Question

$(a)\;\large\frac{1}{2}\qquad(b)\;\large\frac{1}{4}\qquad(c)\;\large\frac{1}{3}\qquad(d)\;\large\frac{1}{6}$