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what is molarity?

Molarity is a measure of concentration of a material in a solution, generally in units of moles per liter abbreviated as M, it is a concentration unit, defined to be the number of moles of solute divided by the number of liters of solution.

For example, a molar (1M) solution of sugar means a solution containing 1 mole of sugar (i.e., 342 g or 6.02 x 10²³ molecules of it) per litre of the solution.