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A solution of urea contains 8.6 gm/litre (mol. Wt. 60.0). It is isotonic with a 5% (W/W) solution of a non-volatile solute having density 1 g/cc. The molecular weight of the solute will be          
Options:
A. 348.8
B. 34.88
C. 3488
D. 861.2

 Next Question
Answer: Option A
: A

Isotonic solutionshavesameosmoticpressure
As Osmotic pressure = C R T
C1=C2
n1V1=n2V2
5% W/W solutionmeans 100g ofsolution contains 5gofsolute
8.6601=5M1001000
M=5×60×108.6=348.8

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