Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and B are 55 and 
respectively. What is the mole fraction of 
in solution of 
and 
in equilibrium with a vapour in which the mole fraction of A is 0.8?
Text Solution
Verified by ExpertsThe correct answer is:
C
For an ideal solution with Raoult's law, the partial pressure of A in vapour is 
where 
is the mole fraction in vapour phase. Thus 
.
Using the equilibrium condition 
where 
is mole fraction in liquid and 
:
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