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Q.

At 25∘C, the vapour pressure of pure liquid A (MW = 40) is 100 torr, while that of pure liquid B (MW = 80) is 40 torr. The vapour pressure at 25∘C of a solution containing 20 g of each of A and B is         

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a

68 torr

b

80  torr

c

59.8 torr

d

48  torr

answer is A.

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Detailed Solution

P=PA0XA+PB0XB=100×23+40×13=80  torr

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At 25∘C, the vapour pressure of pure liquid A (MW = 40) is 100 torr, while that of pure liquid B (MW = 80) is 40 torr. The vapour pressure at 25∘C of a solution containing 20 g of each of A and B is