Molality

Not to be confused with Molarity.

In chemistry, molality is a measure of the amount of solute in a solution relative to a given mass of solvent. This contrasts with the definition of molarity which is based on a given volume of solution.

A commonly used unit for molality is moles of solute per kilogram solvent (mol/kg). A solution of concentration 1 mol/kg is often written as 1 molal (or 1 m).

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