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Equal mass of methane and oxygen are mix...

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

A

`(1)/(3)`

B

`(1)/(2)`

C

`(2)/(3)`

D

`(1)/(3) xx (273)/(298)`

Text Solution

Verified by Experts

The correct Answer is:
A
Let `32 g` of each be present.
Moles of `O_(2) = (32)/(32) = 1`
Moles of `CH_(4) = (32)/(16) = 2`
Mole fraction of `O_(2) = (1)/(1 + 2) = (1)/(3)`
which is same as the fraction of pressure.
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