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Two liquids Aand B have vapour pressures...

Two liquids `A`and `B` have vapour pressures in the ratio of `p_(A)@,p_(B)@` = 1 : 2 at a certain temperature. Suppose we have an ideal solution of `A` and `B` in the mole fraction ratio `A:B = 1:2`. What would be the mole fraction of `A` in the vapour in equilibrium with the solution at a given temperature?
a.`0.25` , b.`0.2` , c.`0.5` d.`0.33`

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