1.

Liquid A and B from an ideal solution. If vapour pressure of pure A and B are 500 Nm^(-2) and 200 Nm^(-2) respectively , the vapour pressure of a solution of A in B containint 0.2 mole fraction of A would be

Answer»

`700 N m^(-2)`
`300 N m^(-2)`
`260 N m^(-2)`
`140 N m^(-2)`

Solution :`P_(A) = X_(A) P_(A)^(o)=0.2 XX 500 = 100 N m^(-2)`
`P_(B)=X_(B)P_(B)^(o)=0.8 xx 200 = 160 N m^(-2)`
Total V.P. of the solution =`100+160=260Nm^(-2)`


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