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Chemistry - Liquid Solution Question with Solution | TestHub

ChemistryLiquid SolutionRaoult's LawMedium2 minPYQ_2018
ChemistryMediumnumerical

Liquids A and B form ideal solution over the entire range of composition. At temperatureT, equimolar binary solution of liquids A and B has vapour pressure45 Torr. At the same temperature, a new solution of A and B having mole fractionsxA and xB, respectively, has vapour pressure of22.5 Torr. The value ofxAxB, in the new solution is ____.
(Given that the vapour pressure of pure liquid A is20 Torrat temperatureT)

Answer:
19.00
Solution:

45=PAo×12+PBo×12
PAo+PBo=90....i
Given,PAo=20 Torr
PBo=70 Torr
22.5 torr=20xA+701-xA
=70-50 xA.
xA=70-22.550=0.95
xB=0.05
So,XAXB=0.950.05=19.

Subject:ChemistryTopic:Liquid SolutionSubtopic:Raoult's Law
2mℹ️ Source: PYQ_2018

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