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Question

A mixture of He and SO2 at one bar pressure contains 20% by weight of He. Partial pressure of He be:

A
0.2 bar
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B
0.4 bar
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C
0.6 bar
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D
0.8 bar
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Solution

The correct option is D 0.8 bar

Mixture contains 20g He and 80g SO4

No of moles of He = 20/4 = 5 mol

No of moles of SO4 = 80/64 = 1.25 mol

Mole Fraction of He = 5/6.25 = 0.8

And Partial Pressure of He= 0.8 x 1 bar

= 0.8 bar


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