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An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

1. Addition of NaCl
2. Addition of Na2SO4
3. Addition of 1.00 molal KI
4. Addition of water

Correct answer: Addition of water

Solution

Adding water dilutes the solution, reducing the solute concentration and increasing the vapor pressure as it approaches that of pure water.

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