Q.

The vapor pressure of pure benzene and toluene are 160 Torr and 60 Torr respectively. The mole fraction of benzene in vapor phase in contact with equimolar solution of benzene and toluene would be

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a

0.50

b

8/3

c

0.73

d

0.27

answer is B.

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Detailed Solution

P=PBXB+PTXT

P = 160 × 0.5 + 60 × 0.5

Ptotal=110

YB=PBOXBP=160×0.5110

= 0.73

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The vapor pressure of pure benzene and toluene are 160 Torr and 60 Torr respectively. The mole fraction of benzene in vapor phase in contact with equimolar solution of benzene and toluene would be