Relation between relative lowering of vapour pressure and mole fraction
Answers
Relative Lowering of Vapour Pressure
Vapour pressure is the pressure exerted by the vapours over the liquid under the equilibrium conditions at a given temperature. Now let us take an example of a pure liquid, the surface of the liquid is occupied by the molecules of the liquid. Suppose a non-volatile solute is now added to this pure liquid. Since the solute molecules are non-volatile, the vapour above the solution consists of only solvent (pure liquid) molecules. After adding the solute, the vapour pressure of the solution is found to be lower than that of the pure liquid at a given temperature.
Answer:
● P knaught B is the vapour pressure of solute.
● Since a non volatile solid is added, vapour pressure will be zero and hence PB will be zero.
● Further the calculations are given in the attachment.
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