Question

5 mL of acetone is mixed with 100 mL of H₂O. Vapour pressure of water above the solution is:

• A. Equal to vapour pressure of pure water
• B. Equal to vapour pressure of the Solution
• C. Less than vapour pressure of pure water
• D. More than vapour pressure of pure water

Answer 1

The correct option is C

Less than vapour pressure of pure water

Vapour pressure of any component in the solution = mole fraction of the component X V P of that component in pure state.
molefraction is always < 1