1.

The vapour pressure of pure components A and B are 200 torr and 100 torr respectively. Assuming a solution of these components obeys Raoult's law, the mole fraction of component. A in vapour phase in equilibrium with a solution containing equimoles of A and B is :

Answer»

<P>0.22
0.33
0.67
0.5

Solution :`P_(A)=200xx0.5=100` torr
`P_(B)=100xx0.5=50` torr
`P_("(total)")=P_(A)+P_(B)=100+50=150` torr
MOLE fraction of A in vapour PHASE
`=(100)/(150)=0.67`


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