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Question

Equal mass of H2, He and CH4 are mixed in empty container at 300K, when total pressure is 2.6 atm. The partial pressure of H2 in the mixture is:

A
2.1 atm.
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B
1.6 atm.
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C
0.8 atm.
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D
0.2 atm.
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Solution

The correct option is B 1.6 atm.
According to Dalton's law, the partial pressure of a gas is equals to the product of total pressure and mole fraction.
We have H2,HeandCH4 gas with equal mass, m.
Total Pressure = 2.6 atm
PartialPressureofH2=TotalPressure×χH2
=2.6×nH2nH2+nHe+nCH4
=2.6×m2m2+m4+m16
=2.6×813
PartialPressureH2=1.6atm

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