1.

At 300 K when a solute is added to a solvent its vapour pressure over the mercury reduceds from 50 mm to 45mm. The value of mole fraction of solute will be

Answer»

`0.005`
`0.010`
`0.100`
`0.900`

Solution :`(P^(0)-P)/(P^(0))= X_(B)`
`(5)/(50) =X_(B)`


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