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Q.

At 25oC, t]le vapour pressure of pure liquid A (mol. wt. = 40) is 100 torr while that of pure liquid B is 40 torr, (mol. wt. - B0). The vapour pressure at 25oC of a solution containing 20 g of each A and B is:

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a

80 torr

b

59.8 torr

c

68 torr

d

48 torr

answer is A.

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Detailed Solution

Molesof A=2040⇒0.5 ;  molesof B=2080⇒0.25 xA=0.50.5+0.25=0.67; xB=0.33 Ptotal =PA∘XA+PB∘XB ⇒100×0.67+40×0.33⇒80 torr
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