Molality is the number of moles of solute per kg (kilogram) of the solvent.
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Molality is a measure of the concentration of a solution. It is the number of moles of solute that are present per 1 kg of the solvent. ie, Molality (m) $=$ Number of moles of solute$/$Mass of solvent in Kg Molality of a solution does not change with the change in temperature.