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Equal masses of methane and oxygen are m...

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:

A

`2/3`

B

`1/3 xx 273/298`

C

`1/3`

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
C
Let the mass of methane and oxygen is w
mole fraction of oxygen = `(w/32)/(omega/32+omega/16)`
`= (1/32)/(1/32+1/16) = (1/32)/(3/32) =1/3 ` Let the total pressure be P
The pressure exerted by oxygen (partial pressure )
`= X_(O_(2))xx P_("total") rArr P xx 1/3 ` .
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