Question -
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
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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