Ncert Exercises & Solutions

The unit of Ebullioscopic constant is:

1. K kg mol^–1 or K (molality)^–1

2. mol kg K^–1 or K^–1 (molality)

3. kg mol^–1 K^–1or K^–1 (molality)^–1

4. K mol kg^–1 or K (molality)

Hint: Ebullioscopic constant is same as molal elevation constant

As we know from elevation in boiling point that

{ΔT}_{b} = K_{b} m

K_{b} = \frac{{ΔT}_{b}}{m}

Unit of K_b =

\frac{unit of {ΔT}_{b}}{unit of m} = \frac{K}{molality}

\frac{K}{mol}

{kg}^{- 1}

= K mol^-1kg