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Question

A mixture of hydrogen and oxygen at one bar pressure contains 20%, by weight, of hydrogen. The partial pressure of hydrogen will be?

A
8 bar
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B
0.8 bar
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C
4 bar
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D
6 bar
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Solution

The correct option is B 0.8 bar
% by weight=20% hydrogen

% by weight=80% oxygen

Let's take the total weight as 100g

So, amount of H2=20g

Moles of H2=20/2=10 mol

Amount of O2=80g

Moles of O2=80/32=2.5 mol

XH2=1010+2.5=1012.5=0.8

So, PH2=PT×XH2

PH2=1 bar ×0.8

PH2=0.8 bar


Hence, option B is correct.

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