Question

The boiling point of a 0.2 m solution of a non-electrolyte in water is ______.

(K_b, for water = 0.52 K kg mol⁻¹)

Options

• 100°C

• 100.52°C

• 100.104°C

• l00.26°C

Answer 1

The boiling point of a 0.2 m solution of a non-electrolyte in water is 100.104°C.

Explanation:

Molality of solution = 0.2 m

K_b of water = 0.52 K kg mol⁻¹

Boiling Point Elevation

For most non-electrolytes dissolved in water, the van't Hoff factor is essentially 1.

Hence, Elevation in Boiling point = 0.52 × 0.2 = 0.104°C

∴ Therefore, Boiling point = 100 + 0.104

= 100.104°C