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Q.

The  value of P0 for benzene is 640 mm of Hg. The vapour pressure of solution containing 2.5 gm substances in 39gm benzene is 600mm of Hg the molecular mass of X is 

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a

65.25

b

40

c

80

d

130

answer is D.

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Detailed Solution

P0−PP0=n2n1+n2⇒640−600640=2.5/m39/78

m=640X78X2.539X40=80

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