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Question

A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.

Solution
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In 100 g of mixture, the mass of hydrogen and oxygen will be 20 and 80 g respectively.
The number of moles of hydrogen are n=202=10.
The number of moles of oxygen are n=8032=2.5.
The mole fraction of hydrogen is 1010+2.5=0.8.
Partial pressure of hydrogen is 0.8×P=0.8×1=0.8 bar.

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