Q.

Benzene and toluene form nearly ideal solutions. At 20oC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20oC for a solution containing 78 g benzene and 46 g toluene in torr is:

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a

50

b

25

c

375

d

53.5

answer is A.

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Detailed Solution

P'B=PBo.XB=75×78787878+4692 =75×11+12=75×23=50
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