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

Answer

A

Explanation

Let mass of each gas `CH_(4)` and `O_(2) = 32 g`
(Mol. Mass of `rCH_(4) = 16`, Mol. Mass of `O_(2) = 32`)
`x_(CH_(4)) = (32)/(16) = 2, x_(O_(2)) = (32)/(32) = 1`
`:. X_(O_(2)) = x_(O_(2)) xx P_("Total") = (1//3) xx P_("Total")`