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The vapour pressure of pure benzene and ...

The vapour pressure of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour phase in contact with equimolar solution of benzene and toluene is

A

0.5

B

0.16

C

0.27

D

0.73

Text Solution

Verified by Experts

The correct Answer is:
C
For equimolar solution, let us take
`x_A=x_B = 0.5`
`P_("benzene") = 160 xx 0.5 = 80` torr,
`P_("toluene") = 60 xx 0.5 = 30` torr
`P_("total") = 80 + 30 = 110` torr
Mole fraction of toluene in vapour phase
`("Partial vapour pressure of toluene")/("Total vapour pressure")=30/110 = 0.27`
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Knowledge Check

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