Most other solvents have a specific gravity greater than or less than one. Therefore, one liter of anything other than water is not likely to occupy a liter of space. The atomic weight of sodium is 23 and the atomic weight of chlorine is 35. Therefore the formula weight for NaCl is 58, and 58 grams of NaCl dissolved in 1kg water would result in a 1 molal solution of NaCl. The molar unit is probably the most commonly used chemical unit of measurement.
Molarity is the number of moles of a solute dissolved in a liter of solvent .
A molar solution of sodium chloride is made by placing 1 mole of a solute into a 1-liter volumetric flask. Water is then added to the volumetric flask up to the one liter line. The result is a one molar solution of sodium chloride. There is a relationship between normality and molarity. Normality can only be calculated when we deal with reactions, because normality is a function of equivalents.