1.

Two liquids A andB have vapour pressures 500 and 200 torr respectively at a certain temperature. In an ideal solution of the two, the mole fraction of A at which two liquids have equal partial pressures is :

Answer»

`0.50`
`0.20`
`0.286`
`0.714`

SOLUTION :Let the MOLE FRACTION of A is `X`
Mole fraction of `B=1-x`
`500x=200(1-x)`
or `700 x=200` or `x=(200)/(700)=2/7=0.286`


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