The vapour pressure of two liquids P and Q are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 ~mol of Q would be:

Step-by-step solution

By Raoult's Law P _ T = P _ P ^ X _ P + P _ Q ^ X _ Q aligned & P _ P ^ =80 torr & X _ P = 3 5 & P _ Q ^ =60 torr aligned aligned X _ Q & = 2 5 P _ T & =80 3 5 +60 2 5 & =48+24 P _ T & =72 torr. aligned Related Theory Solutes which dissociate or associate in a particular solution will not obey Raoult's law. Raoult's law applies to solutions containing non-volatile solute only. Raoult's law cannot be applied to concentrated solutions.