Chemistry - Liquid Solution Question with Solution | TestHub

Using the formula for depression in freezing point:

$\Delta T_f=K_f\times m$

Given $\Delta T_f=2.4$ K and $m=0.4$ mol kg${}^{-1}$.

Substituting the values:

$2.4=K_f\times 0.4$

$K_f=\frac{2.4}{0.4}=6.0$ K kg mol${}^{-1}$

Answer: $6.0{\text{K kg mol}}^{-1}$