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Definition of molarity:
Molarity (M), or molar concentration, is the concentration of a solution measured as the number of moles of solute per liter of solution. [1]
This is the common definition for molarity, other definitions can be discussed in the article


The mass of one mole of a chemical compound in grams is numerically roughly equivalent to the number of nucleons. For example, one mole of water (H2O) has a total mass of 18.015 grams which is close to the combined atomic mass number of 18.