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A solution of urea (molecular mass = 60 ...

A solution of urea (molecular mass = 60 g `mol^(-1)`) boils at `100.18^(@)C` at 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 :

A

`0.654^(@)C`

B

`-0.654^(@)C`

C

`6.54^(@)C`

D

`-6.54^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
b
`(DeltaT_(f))/(DeltaT_(b))=K_(f)/K_(b)`
`DeltaT_(f)=DeltaT_(b)=(0.18^(@))xx(1.86)/(0.512)=0.654^(@)C`
Freezing point of solution
= `0-0.654^(@)C=-0.654^(@)C`
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