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If we assume that the density of the solution is almost equal to that of pure water (1 kg/L), then we find that 1 L of solution will weigh 1 kg. If 1 kg of solution contains 0.0001 M of sucrose , then it is 0.0001 m in sucrose, so the molarity and molality are almost the same. I think they are numerically the same to several decimal places.
Noun. 1. molality-concentration measured by the number of moles of solute per kilogram of solvent. molal concentration. concentration-the strength of a solution; number of molecules of a substance in a given volume. 1  Facebook. 2  Twitter.