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(C) The vapour pressure of a solution is determined by the mole fraction of the solvent. According to Raoult's Law,$P_{sol} = X_{solvent} 	imes P^0_{

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Addition of water

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(C) The vapour pressure of a solution is determined by the mole fraction of the solvent. According to Raoult's Law,$P_{sol} = X_{solvent} 	imes P^0_{solvent}$.Adding water to an aqueous solution increases the amount of solvent relative to the solute,thereby increasing the mole fraction of the solvent $(X_{solvent})$.Since $P^0_{solvent}$ (vapour pressure of pure water) is constant at a given temperature,an increase in $X_{solvent}$ leads to an increase in the vapour pressure of the solution.Adding more solute (as in options $A$,$B$,and $D$) would decrease the mole fraction of the solvent,thereby decreasing the vapour pressure.

Which of the following changes will cause an increase in the vapour pressure of a $1 \ m$ aqueous $KI$ solution at the same temperature?

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