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Q.

The vapour pressure of a solution of a non-volatile solute Bin a solvent A is 95% of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is 0.3 times the molecular weight of the solute, what is the ratio of weight of solvent to solute?

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a

0.2

b

5.7

c

0.15

d

None of these

answer is B.

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Detailed Solution

Xsolvent =0.95

0.95=w10.3M0w10.3M0+w2M0

0.95=w1w2w1w2+0.3

w1w2=5.7

Hence, option B is correct.

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