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Molality is another way of expressing the concentration of a solution: It is the quantity, in moles, of solute present in 1 kg of solvent. Until now, the various types of concentrations studied have always related the quantity of solute to the quantity of solution. In the case of molality, the quantity of solute is related to the quantity of solvent only. To facilitate understanding, watch the video lesson on the study of Moles: • CONCEPT OF MOLE AND MOLAR MASS