The molal b.p. constant for water is 0.5130C kg mol– 1. When 0.1 mole of sugar is dissolved in 200 g of water, the solution boils under a pressure of 1 atm at

b T mK Given 0.513 / o b K C kg mol 100o T C Moles of sugar = 0.1 Mass of water = 0.2 kg Molality (m) = 0.1 0.2 m = 0.5 0 100 0.5 0.513 100.256 b b b b o b T m K T T T T T C x x