question_answer 10)

Boiling point of water at 750 mm Hg is 96.63°C. How much sucrose is to be added to 500 g of water such that it boils at 100°C? Molal elevation constant for water is 0.52 K kg mol–1.

Answer:

Elevation in boiling point required, 100 ? 96.63° = 3.37°C = 3.37 K Mass of solvent (water), w1 = 500 g Molar mass of solvent, M1 = 18 g mol-1 Molar mass of solute, (C12H22O11) = 342 g mol-1 Applying the formula,  or   = 1108.2 g.