Equal weights of methane and oxygen are mixed in an empty container at `25^(@)C`. The fraction of the total pressure exerted by oxygen is

Options

A. `(1)/(3)`
B. `(1)/(2)`
C. `(2)/(3)`
D. `(1)/(3) xx (273)/(298)`

Answer

A

Explanation

`(n_("methane"))/(n_(O_(2))) = (W_(CH_(4)))/(M_(CH_(4))) = (32)/(16) = 2`
`x_(CH_(4)) = (2)/(3) x_(O_(2)) = (1)/(3) P_(O_(2)) = x_(O_(2)) xx P_("total") = (1)/(3)` part