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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.
The molality of a solution is the moles of solute dissolved in 1 kilogram (1000g) of solvent (often water). The symbol for molality is lower case âmâ. Thus a 3.0 molal solution of nitric acid, abbreviated 3.0 m HNO3, contains 3.0 moles of HNO3 in 1 kg of water.olarity (M), molality (m) and the Colligative properties. The molarity of a solution is the number of moles of solute per liter of solution.