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Question

Equal masses of methane and oxygen are mixed in an empty container at 25C. The fraction of the total pressure exerted by oxygen will be:

A
12
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B
23
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C
13×273298
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D
13
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Solution

The correct option is C 13
Let 32 gm CH4 and O2 each are mixed and let total pressure be P.
Moles of CH4=3216=2 moles
Moles of O2=3232=1 mole
χCH4=23
χO2=13
According to Dalton's law of partial pressure,
PA=χA . Ptotal
PO2=13×P=P3
O2 exerts one - third of total pressure.

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