K/molal
kelvin per molal
Molal constantexact by definition
The kelvin per molal is exactly equal to K·kg/mol, since a molal is a mole per kilogram of solvent and dividing by it restores the kilogram to the numerator. It is how textbooks usually write cryoscopic and ebullioscopic constants: water's freezing point depression constant is 1.86 K/molal.
Watch out: Written K/m in most textbooks, where m means molal and not metre. The catalog spells out "molal" because a symbol reading K/m in a unit list would be read as kelvin per metre by anyone who did not already know.
| 1 K/molal | 1 K·kg/mol |
Solvers that use molal constant