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Question: Equal masses of helium and oxygen are mixed in a container at \(25^{0}C\). The fraction of the total...

Equal masses of helium and oxygen are mixed in a container at 250C25^{0}C. The fraction of the total pressure exerted by oxygen in the mixture of gases is.

A

1/3

B

2/3

C

1/9

D

4/9

Answer

1/9

Explanation

Solution

: Mole fraction of

O2O_{2}=w32w32+w4=w32×329w=19\frac{\frac{w}{32}}{\frac{w}{32} + \frac{w}{4}} = \frac{w}{32} \times \frac{32}{9w} = \frac{1}{9}

Partial pressure of oxygen

=P×xo2=Ptotal×19or19Ptoal= P \times xo_{2} = P_{total} \times \frac{1}{9}or\frac{1}{9}P_{toal}