First slide

Theory of dilute solutions

Question

The vapour pressure at a given temperature of an ideal solution containing 0.2 mol of non-volatile solute and 0.8 mol of a solvent is 60 mm of Hg. The vapour pressure of the pure solvent at the same temperature will be

Moderate

A

120 mm Hg
B

150 mm Hg
C

60 mm Hg
D

75 mm Hg

Solution

$\frac{P °_{A} - 60}{P °_{A}} = X_{B} = 0.2 \Rightarrow P °_{A} = 75 m m H g$

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