How is molar mass typically expressed?

Molar mass is defined as the mass of one mole of a substance, and it is typically expressed in grams per mole. This unit is widely used in chemistry because it directly relates to the mass of substances in practical laboratory conditions. Using grams allows for straightforward calculations when working with chemical reactions, stoichiometry, and the preparation of solutions, since many laboratory measurements are made in grams.

While other units, such as kilograms per mole, could theoretically be used, they are less common in typical chemical applications and may complicate calculations without providing additional benefit. Pounds and ounces per mole are not standard units within the realm of chemistry because they are less suited to the metric system, which is the preferred system of measurement in scientific contexts. Thus, grams per mole is the accepted and most convenient unit for expressing molar mass.