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
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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:
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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