Molality Definition

Molality is a unit of concentration of a chemical solution.
Molality is a unit of concentration of a chemical solution. Rafe Swan, Getty Images

Molality Definition: a unit of concentration, defined to be equal to the number of moles of solute divided by the number of kilograms of solvent.

Examples: The solution made by dissolving 0.10 mol of KNO3 into 200 g of H2O would be 0.50 molal in KNO3 (0.50 m KNO3).

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