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Two liquids A and B form an ideal soluto...

Two liquids `A` and `B` form an ideal soluton. The vapour pressure of pure `A` and pure `B` are `66 mm Hg` and `88 mm Hg`, respectively. Calculate the composition of vapour `A` in the solution which is equilbrium and whose molar volume is `36%`.

A

0.43

B

0.7

C

0.3

D

0.5

Text Solution

Verified by Experts

The correct Answer is:
A
`chi_(A)^(V)=0.36 = (P_(A)^(@)chi_(A))/(P_(A)^(@)chi_(A) + P_(B)^(@) (1-chi_(A))`
`rArr 0.36 xx P_(B)^(@)(1-chi_(A))=0.64 P_(A)^(@)chi_(A)`
`rArr chi_(A) = 0.43`
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