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Question

A mixture of volatile components A and B has total vapour pressure (in torr) as P=254119χA, where χA is the mole fraction of A in the mixture. Hence, PoA and PoB respectively are (in torr):

A
254,119
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B
119, 254
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C
135, 254
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D
154, 119
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Solution

The correct option is B 135, 254
PTotal=PoAχA+PoBχB
=PoAχA+PoB(1χA)
=PoB(PoBPoA)χA
Given equation =254119χA
Compare with the given equation,
PoB=254,PoBPoA=119
PoA=254119=135

Option C is correct.

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