The vapor pressure of pure water is 24 mm Hg at a certain temperature. What is the vapor pressure of a solution with a s
Mole fraction of water = 1 - 0.25 = 0.75 . Vapor pressure = 24 × 0.75 = 18 mm Hg .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Vapour Pressure and Raoult's Law - Ideal and Non-ideal Solutions