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Question

The vapour pressure of a benzene – toluene binary solution at certain temperature is given by P=450100XT.
Where XT is the mole fraction of toluene. Find the vapour pressures of Benzene and Toluene in pure state.


A
PoB=350 PoT=450
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B
PoB=150 PoT=350
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C
PoB=450 PoT=350
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D
PoB=350 PoT=150
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Solution

The correct option is C PoB=450 PoT=350
PoT and PoB = vapour pressure of pure toluene and pure benzene respectively.
P=PoB XB+PoT XT
=PoB(1XT)+PoT XT
=PoBPoBXT+PoT XT
=PoB+(PoTPoB)XT(1)
P=450100X(2)
Comparing both equations

=PoB=450
=PoT450=100
PoT=350

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