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The vapour pressure of a solution of a n...

The vapour pressure of a solution of a non-volatile electrolyte `B` in a solvent `A` is `95%` of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is `0.3` times, the molecular weight of solute, the weight ratio of the solvent and solute are:

Text Solution

Verified by Experts

From Raoult's law
`(P_(0)-P)/(P_(0))=(W_(B)xxM_(A))/(W_(A)xxM_(B))`
or `1/20=(0.3xxW_(B))/(W_(A))`
`:.(W_(A))/(W_(B))=0.3xx20=6.0`
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