80 mole percent of MgCl2 is dissociated in aqueous — JEE Mains Chemistry Past Papers Chemistry Question

💡 Solution & Explanation

ution of MgCl2 at 38°C is mm Hg. (Nearest integer) Given: Vapour pressure of water at 38°C is 50 mm Hg Ans. NTA : 48 Sol. M molality i P P P s s o     i = 1 + (n – 1) i = 1 + (3 – 1)× 0.8 = 2.6 1 m = 1 mole of solute MgCl2 dissolve in 1000 g of solvent water. so s s P P 50  = / 1 .  = 50 – PS = 0.0468 × PS 1.0468 PS = 50 so PS = . 50 = 47.764 mm of Hg