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At 90^(@) C, the vapour pressure of tolu...

At `90^(@)` C, the vapour pressure of toluene is `400` torr and that of `sigma-`xylene is `150` torr. What is the composition of the liquid mixture that boils at `90^(@)` C, when the pressure is `0.50` atm ? What is the composition of vapour produced ?

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The correct Answer is:
`92` mol `%` toluene; `96.8` mol `%` toluene
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