1.

Calculate the freezing point of a solution that contains 30 g urea in 200 g water. Urea is a non-volatile, non-electrolytic solid. K_(f) for water =1.86^(@)C//m.

Answer»

`4.65^(@)C`
`-4.65^(@)C`
`-0.744^(@)C`
`+0.744^(@)C`

Solution :`DeltaT_(f)=K_(f)XX m`
`=1.86xx(30)/(60)xx(1000)/(200)=4.65^(@)C`
`:.T_(f)=0-4.65= - 4.65^(@)C`


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