Q.
Two liquids A and B have PA∘ and PB∘ in the ratio of 1 : 3 and the ratio of number of moles of A and B in liquid phase are 1 : 3 then mole fraction of ? in vapour phase in equilibrium with the solution is equal to:
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a
0.1
b
0.2
c
0.5
d
1.0
answer is A.
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Detailed Solution
xA=11+3⇒14; xB=34 yAyB=PA∘PB∘×xAxByA1−yA=13×13 ⇒19 or yA=110
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