Moles of solute per kilogram of solvent; the molarity is equal to mρ/(1 + mM), where m is the m., ρ is the density of the solution, and M is the molar mass of the solute. Cf.:molarity.
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mo·lal·i·ty (mo-lalґĭ-te) the number of moles of a solute per kilogram of pure solvent. NOTE: molality refers to the weight of the solvent, molarity to the volume of the solution.Medical dictionary. 2011.