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Q.

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

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a

$\begin{aligned} 105.0 g {mol}^{- 1} \end{aligned}$

b

$\begin{aligned} 210.0 g {mol}^{- 1} \end{aligned}$

c

$90.0 g {mol}^{- 1}$

d

$15.0 g {mol}^{- 1}$

answer is B.

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Detailed Solution

The molar mass of the substance,

$\frac{5.25}{M} = \frac{1.5}{60} \Rightarrow M = 210$

Thus, the correct option is B.

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