Understanding Molality

Molality (m) is a measure of concentration that expresses the number of moles of solute per kilogram of solvent.

Formula:

Molality (m) = moles of solute / kilograms of solvent

Calculations:

* Moles of solute (NaCl): 3.0 moles

* Kilograms of solvent (water): 1.5 kg

Substituting into the formula:

Molality (m) = 3.0 moles / 1.5 kg = 2.0 mol/kg

Answer: The molality of the solution is 2.0 mol/kg.