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A solution of urea (mol. Mass 60 g mol^(...

A solution of urea (mol. Mass `60 g mol^(-1)`) boils of `100.18^(@)C` at one one atmospheric pressure. If `k_(f)` and `K_(b)` for water are `1.86` and `0.512 K kg mol^(-1)` respectively, the above solution will freeze at:

Text Solution

Verified by Experts

For a solution of molality (m)
`m=(DeltaT_(t))/(K_(t))=(DeltaT_(t))/(K_(b))`
`rArr DeltaT_(t)=DeltaT_(b)xx(K_(t))/(K_(b))`
`DeltaT_(t)=(100.18-100)xx(1.86)/(0.512)xx0.654^(@)C`
As freezing point of pure water is `0^(@)C`, the freezing point of the solution will
`0.654^(@)C`
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