Question

What is the molality of a solution containing 8.0 grams of solute in 0.50 kg of solvent? (molar mass of solute = 24 g)

Answer 1

The molal concentration of the solution is 0.67 mol/kg.

The formula for molal concentration (b) is

b = moles of solute/kilograms of solvent.

Moles of solute = 8.0 g × (1 mol/24 g) = 0.333 mol

b = 0.333 mol/0.50 kg = 0.67 mol/kg