Molal elevation in boiling point constant depends on

Different solvents are having different K_b values

${\mathrm{K}}_{\mathrm{b}}=\frac{{\mathrm{M}}_1\mathrm{R}{\left({\mathrm{T}}_{\mathrm{b}}^0\right)}^2}{∆{\mathrm{H}}_{\mathrm{v}}}$

M₁ = molar mass of solvent

${\mathrm{T}}_{\mathrm{b}}^0$ = boiling point of solvent

$∆{\mathrm{H}}_{\mathrm{v}}$= enthalpy of vaporisation

R = universal gas constant