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A solution containing 10 g per dm^(3) of...

A solution containing 10 g per `dm^(3)` of urea (molecular mass = 60 g `mol^(-1)`) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this non-volatile solute is

A

250 g `mol^(–1)`

B

300 g `mol^(–1)`

C

350 g `mol^(–1)`

D

200 g `mol^(–1)`

Text Solution

Verified by Experts

The correct Answer is:
B
For isotonic solution `pi_(1)=pi_(2)`
or `C_(1)=C_(2)`(conc.in mol/lit.)
(Urea solution)(unknown solution)
`(10)/(60)=(5xx1000)/(m_(w)xx100)`
`m_(w)=300 gm mol^(-1)`
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