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  4. A 3% aqueous solution of urea is isotonic to 5% aqueous solution of another solute. Considering van't Hoff factor of the other solute to be 1.0, determine its molecular mass.

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Q. A 3% aqueous solution of urea is isotonic to 5% aqueous solution of another solute. Considering van't Hoff factor of the other solute to be 1.0, determine its molecular mass.Chemistry Question Image

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Solution:

$\pi = C_{1}RT$
$\pi = C_{2}RT$
$\therefore \quad C_{1} = C_{2}$ or $n_{1} = n_{2}$
$\Rightarrow \quad \frac{3}{60} = \frac{5}{Mol. \,mass} \quad\Rightarrow \quad$ Mol. mass $= 100$