Molality or molal concentration, is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent.
Molality value does not change with changes in temperature.
Formula to calculate molality.
Suppose 0.5 moles of Sodium chloride was dissolved in 1Kg of water. Calculate its molality.
Thus, the molality is 0.5 molal.