Question

Boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 500 g of water such that it boils at 100°C?.

Answer 1

Elevation in boiling point required, ∆T_b = 100 – 99.63° = 0.37°

Mass of solvent (water) W₁ = 500g

Mass of solute, C₁₂H₂₂O₁₁ = 342 g mol^-1

Molar mass of solvent M₁ = 18 g mol^-1 

Applying the formula,