Q.

The vapour pressure of pure liquids A and B are 100mm and 200mm respectively. The total vapour pressure of the solution is 175mm. If A and B forms an ideal solution then the mole fraction of A in liquid and vapour phase respectively are

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a

0.52, 0.41

b

0.41, 0.52

c

0.14, 0.25

d

0.25, 0.14

answer is A.

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Detailed Solution

P=PAoxA+PBoxB

175=100×xA+200(1xA)

175=100×xA+200200xA

25=100xA

xA=25100=0.25

yA=PAP=PAoxAP

yA=100×0.25175=25175= 0.14

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The vapour pressure of pure liquids A and B are 100mm and 200mm respectively. The total vapour pressure of the solution is 175mm. If A and B forms an ideal solution then the mole fraction of A in liquid and vapour phase respectively are