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

Answer

D

Explanation

`P_(O_(2)) = chi_(O_2) xx P implies chi_(O_2) = ((x)/(32))/((x)/(32) + (x)/(16)) = (1)/(3) implies P_(O_(2)) = (1)/(3) P`