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Elevation in boiling point of an aqueous...

Elevation in boiling point of an aqueous solution of urea is `0.52 ( k_(b) "for water"=0.52K"molality"^(-1))`. The mole fraction is urea in this solution is :

A

`0.98`

B

`0.0567`

C

`0.943`

D

`0.02`

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta T = K_(b) xx "molality"`
`0.52 = 0.52 xx "molality"`
`:. (n)/(W) xx 1000 = 1`
`(nxx1000)/((W)/(M) xx M) = 1`
or `(n)/(N) = (18)/(1000)`
or `(N+n)/(N) = (1018)/(1000) = 1.018`
`:. (N)/(n+N) = 0.98`,
`:. (n)/(n+N) = 0.02`
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