Q5. 10g an organic compound Quinine, used to treat malariais dissolved in 50 ml of ethanol(density of ethanol is 0. 789 g/ml), freezes 1. 55 ° C below that of plJre ethanol. Deternaine themolar mass of quinine. (Kf of ethanol is 1. 99 ° C/m). Ans ; 325g/mol.