Why does a solution containing non-volatile solute have higher boiling point than the pure solvent ?
What is meant by positive deviations from Raoult's law? Give an example. What is the sign of ∆mixH for positive deviation?
A solution containing 30 g of non-volatile solute exactly in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 kPa at 298 K. Calculate:
(1) molar mass of the solute
(2) vapour pressure of water at 298 K.