108) What is the value of i (Van′t Hoff factor) for phosphorus?

109) A current of dry air was passed through a solution of 12.5 gm of B in 100 gm of water and then through water alone. The loss in the weight of water was 0.05 gm and that of solution was 1.25 gm. The molecular weight of B is:

110) How much of NaCl should be dissolved in 900 gm of H₂O so that its vapour pressure at 100^oC becomes 380 torr?

111) The vapour pressure of a liquid decreases by 10 torr when a non volatile solute is dissolved. The mole fraction of the solute in solution is 0.1. What will be the mole fraction of the liquid, if the decrease in the vapour pressure is 20 torr, the same solute being dissolved?

112) A 0.2M aqueous solution of a weak acid (HX) is 50% ionized. The freezing point of this solution is: (K_f = 1.86 kg⁄mol for water)