Liquids A and B form ideal solution over the entire range of composition. At temperature T, equimolar binary solution of liquids A and B has vapour pressure 45 Torr. At the same temperature, a new solution of A and B having mole fractions x A and x B , respectively, has vapour pressure of 22.5 Torr. The value of x A / x B in the new solution is____.
(given that the vapour pressure of pure liquid A is 20 Torr at temperature T)
Text Solution
Verified by Experts19
(19)
(Given 
= 20)
90 = 45x2 = 
... (1)
P B ° =90-20=70
22.5 = 
= 20x A+ 70(1-x A )
22.5 = 20x A + 70 - 70x A
= 70 - 50x A
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