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When a solution w g of urea in 1Kg of wa...

When a solution w g of urea in `1`Kg of water is cooled to `-0.372^(@)C,200g`of ice is separated .If `K_(f)`for water is `1.86K Kgmol^(-1)`,w is

A

`4.8g`

B

`12.0g`

C

`9.6g`

D

`6.0g`

Text Solution

Verified by Experts

The correct Answer is:
C
Mass of water present in the solution at the freezing pt.
`= 1000-200=800g.`
`DeltaT_(f)=0.373=(1000xxxk_(f)w)/(60xx800)=(1000xx1.86xxw)/(60xx800)`
or `w=9.6g.`
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