Question

why vapour pressure of a solution is lower than that of pure solvent​

Answer 1

Answer:

The vapour pressure of solution is lower than that of the pure liquid. More correctly, the vapour pressure of solution containing a non-volatile (zero vapour pressure) solute is lower than that of the pure solvent. Because the solution is more stable, fewer molecules are leaving to the gas phase.

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Answer 2

Answer:

At any given temperature , the vapour pressure of a solution containing a non volatile solute is less than that of pure solvent.

this effect is called vapour pressure lowering.

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