Molal depression constant is calculated from the enthalpy of fusion (ΔHf) and boiling point of solvent using the relation
A. K = M₁RT²₀/ 1000 ∆H
B. K = 1000²₀/ M₁∆H
C. K = 1000 M₁T²₀/ R ∆H
D. K = ∆H /1000 M₁RT²₀