Chemistry - Liquid Solution Question with Solution | TestHub

ChemistryLiquid SolutionRaoult's LawEasy2 minPYQ_2020
ChemistryEasysingle choice

What is the mole fraction of toluene in the vapour phase at300Cabove a benzene-toluene solution. The mole fraction of benzene in the solution phase is 0.400?

PB0=119 torr and PT0=37.0 torr, B stands for benzene and T stands for toluene

Options:

Answer:
D
Solution:

P=XAPA0+XBPB0

Total pressure of the sol. is given by

PTotal=XBPB0+XTPT0

=0.4×119+0.6×37

=47.6+22.2=69.8 torr

Applying Dalton's law for mole fraction in vapour phase

YB=PBPTotal=47.669.8=0.68194

YT=1-0.6819 =0.318

Stream:NTA_ABHYAS_NEETSubject:ChemistryTopic:Liquid SolutionSubtopic:Raoult's Law
⏱ 2mℹ️ Source: PYQ_2020

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