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Q.

The vapour pressure of pure benzene is 640 mm at 298K. A solution of a solute in benzene shows a vapour pressure of 630 mm at the same temperature. Then the mole fraction of the solute is

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a

0.25

b

0.18

c

0.016

d

0.20

answer is A.

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Detailed Solution

Given: Vapor pressure of Benzene (p∘​)at 293K= 640mm

            Vapor pressure of solution of Benzene at 293K(P)= 630mm

Po-PPo=Xs Xs=640-630640=10640=0.016

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