Molar mass constant

The molar mass constant, often denoted by \( M_{\text{molar}} \) or \( M \), is a fundamental constant that relates the mass of a substance to the amount of substance in moles. It is defined as the mass of one mole of a substance (usually in grams per mole, g/mol). The molar mass of an element is numerically equal to its atomic mass (in atomic mass units, amu), but expressed in grams per mole.