If w represents the mass fraction of the solute in solution, and assuming no dissociation of the solute, the molar mass is given by M = w K b Δ T .   {\displaystyle M={{wK_{b}} \over {\Delta T}}.\ } International Union of Pure and Applied Chemistry (1993).
Se w representa a concentración porcentual en peso dunha disolución, e supoñendo que o soluto non está disolto, a masa molar ven dada por: M = w K b Δ T .   {\displaystyle M={{wK_{b}} \over {\Delta T}}.\ } International Union of Pure and Applied Chemistry (1993).