Question

When solute is added to solvent vapour pressure decreases why ??

Answer 1

Hey there is your answer


As a result, the vapor pressure for alcohol is greater than that of water for a given temperature.

If you add a nonvolatile solute to solvent such as water, you decrease the tendency for water molecules to evaporate into the gas phase. In essence, the solute particles obstruct or reduce the likelihood of evaporation.

As a result, fewer molecules change from the liquid to the gas phase, thus reducing the vapor pressure.

Answer 2

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