Question - 2.10 - 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.

Solution:

Given,

Elevation of boiling point

Mass of water (W_{ A}) = 500 g

Molar mass (M_{ B}) of sucrose (C_{ 12}H_{22 }O_{11 }) = 12 x 12 + 1 x 22 + 16 x 11 = 342 g mol ^{ – 1}

Molal constant for water (K_{b }) = 0.52 K kg mol ^{ – 1}

Therefore, W_{ B} = ?

We know that,

Thus, 121.67 g of sucrose to be added.

**Topics covered in this chapter of Solutions**