Why are 1 molar and 1 molal solutions of glucose different concentrations?
A 1 mol/kg solution of glucose contains 1 mol sucrose in 1 kg water.
A 1 mol/L solution of glucose contains 1 mol sucrose in 1 L of solution.
The density of the solution is 1.066 g/mL.
∴ The mass of 1 L solution is
Thus the solution contains 1 mol glucose (180.16 g) in 0.886 kg water.
The two solutions each contain 1 mol glucose but different amounts of water.