Molarity

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. This is the common definition for molarity, other definitions can be discussed in the article

Notes

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.