Question

The elevation in boiling point of 0.25 molal aqueous solution of a substance is ______.
(K_b = 0.52 K kg mol^-1)

Options

• 0.15 K

• 0.50 K

• 0.13 K

• 2.08 K

Answer 1

The elevation in boiling point of 0.25 molal aqueous solution of a substance is 0.13 K.

Explanation:

Elevation In boiling Is directly proportional to molal concentration of solute In a solution ΔT_b ∝ m, ΔT_b = K_bm

Given, m = 0.25

K_b = 0.52 K kg mol^-1

The elevation in boiling point (ΔT_b) of 0.25 molal aqueous solution of a substance is

ΔT_b = K_b × m = 0.52 × 0.25 = 0.13 K