According to Konowaloff's rule for fractional distillation, the vapour phase in equilibrium with a b — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

Konowaloff's rule dictates that the mole fraction of the more volatile component is always higher in the vapour phase than in the liquid phase ($Y_A > X_A$ if $P^0_A > P^0_B$). This is the entire functional basis for fractional distillation.