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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