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Relative Lowering of Vapour Pressure

A current of ...

Question

A current of dry air is passed through a bulb containing $5 g$ of a solute in $100 g$ of water and then through water alone. The loss in weight of the solution and pure water were respectively $0.78 g$ and $0.02 g$ . Calculate the relative lowering of vapour pressure.

A

2.04

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B

1.05

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C

0.025

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D

0.09

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Solution

The correct option is C 0.025
loss in weight of pure water $\propto P_{o} - P_{S}$ (i)
and loss in weight of solution ∝ $P_{S}$ (ii)
ratio of (i) and (ii) will give relative lowering of vapour pressure
Using $\frac{P_{o} - P_{S}}{P_{s}} = \frac{0.02}{0.78} = 0.0256$

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