Twenty grams of a solute are added to `100g` of water at `25^(@)C`. The vapour pressure
Channel: Doubtnut
Date: 23/08/2020

Twenty grams of a solute are added to `100g` of water at `25^(@)C`. The vapour pressure of pure water is `23.76 mmHg`, the vapour pressure of the solution is `22.41` Torr. (a) Calculate the molar mass of the solute.  (b) What mass of this solute is required in `100g` of water of reduce the vapour pressure ot one-half the value for pure water?