1.

A 5.25% solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol^(-1)) in the same solvent. If the densities of both solutions are assumed to be equal to 1.0 g cm^(-3), molar mass of the substance will be

Answer»

`90.0 g mol^(-1)`
`115.0 g mol^(-1)`
`1050.0 g mol^(-1)`
`210.0 g mol^(-1)`

Solution :Solutions with the same osmotic pressure are isotonic
Let the MOLAR MASS of the substances be M
`pi = C_(1)RT=C_(2)RT=pi_(2)`
So, `C_(1)=C_(2)`
As DENSITY of the solutions are same
So, `(5.25)/(M)=(15)/(60)RARR M =(5.25xx60)/(1.5)=210`


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