Editing Molality (section)

==Definition==
The molality (''b''), of a [[Solution (chemistry)|solution]] is defined as the [[amount of substance]] (in [[mole (unit)|mole]]s) of solute, ''n''<sub>solute</sub>, divided by the [[mass]] (in [[kg]]) of the [[solvent]], ''m''<sub>solvent</sub>:<ref>{{GoldBookRef | file = M03970 | title = molality}}</ref>

:<math>b = \frac{n_\mathrm{solute}}{m_\mathrm{solvent}}</math>.

In the case of solutions with more than one solvent, molality can be defined for the mixed solvent considered as a pure pseudo-solvent. Instead of mole solute per kilogram solvent as in the binary case, units are defined as mole solute per kilogram mixed solvent.<ref>{{Cite journal |doi = 10.1007/BF00647379|title = Molal volumes of sucrose in aqueous solutions of NaCl, KCl, or urea at 25°C|journal = Journal of Solution Chemistry|volume = 5|issue = 8|pages = 575–585|year = 1976|last1 = Sangster|first1 = James|last2 = Teng|first2 = Tjoon-Tow|last3 = Lenzi|first3 = Fabio|s2cid = 95559765}}</ref>