What is the molality of a solution that contains 3.25 moles of NaCL in 250 mL of water?

Question

What is the molality of a solution that contains 3.25 moles of NaCL in 250 mL of water?

Answer 1

Molality is moles of solute per kg of solvent

moles of solute = 3.25 moles

kg of solvent = 250 ml x1g/ml = 250 g = 0.250 kg (assuming a density of 1g/ml for water)

molality = 3.25 moles / 0.250 kg = 13 m