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Concentrations of solutions in chemistry are usually expressed as molarity, which is the number of moles of solute per liter of solution. To find the molarity of a solution requires knowing the mass of dissolved solute the volume of the solution and molar mass of the solute. Molarity is defined as the number of moles of solute dissolved in 1 liter of solution.. Molarity Formula is given below. Thus molarity has the units moles per liter (mol L-1).
Best Answer: Molality is used in determining the change in freezing point and boiling point. The particles of solute interfere with the process of freezing and boiling making the boiling point lower and the boiling point higher. The more particles of solute per particle of solvent, the more interference there is. Molality measures the moles solute per kilogram of water. Molarity measures the moles of solute liter of solution. Molality measures # of atoms of solute vs number of atoms of solvent. 1 kg of water = 1000 g Ã· 18 g/mole * 6.02 * 10^23 atoms/mole = 3.44 * 10^25 molecules of water.