Given :
Pressure = P = 750 mm Hg
T0 = 273 + 99.63 = 372.63 K
T0 = 273 + 100 = 373 K
Kb = 0.52 K kg mol-1
Molar mass of sucrose (C12H22O11) = 342 × 10-3 kg mol-1
W1 = 500 g = 0.5 kg
Mass of sucrose to be added = W2 = ?
ΔTb = Tb – T0
= 373 – 372.63
= 0.37 K
∴ Mass of sucrose to be added = 121.7 × 10-3 kg
= 121.7 g