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Q.

The mole fraction of a solute in a solution is 0.1 at 298K, molarity of this solution is the same as its molality. Density of this solution is 2 gr/cc. The ratio of molecular weight of solute and solvent $\frac{M_{w} s o l u t e}{M_{w} s o l v e n t}$ is

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answer is 9.

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Detailed Solution

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If M = m, vol of solution = wt of solvent

$\frac{w t o f s o l u t e + w t o f s o l v e n t}{2} = w t o f s o l v e n t$

$0.1 \times M_{1} = 0.9 \times M_{2}$

$\frac{M_{1}}{M_{2}} = 9$

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