What is the Unit of Molality?

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Detailed Solution

The unit of molality is moles per kilogram (mol/kg). Molality is defined as the number of moles of solute dissolved in one kilogram of solvent.

Molality is an important concentration unit because it is independent of temperature. Unlike molarity, which depends on the volume of the solution and can change with temperature (since volume expands or contracts with temperature), molality is based on the mass of the solvent, which remains constant. The formula for molality is:

Molality (m) = moles of solute / mass of solvent (in kg)

This unit allows for more accurate calculations in chemical reactions and colligative properties, where temperature-dependent volume changes are not a concern.

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