which of the following quantities is a molar quantity?

A molar quantity is a quantity that is related to the number of moles of a substance. A mole is the amount of a substance that contains the same number of entities as there are in 12 grams of carbon-12. Out of the options given, both "Molarity" and "Molar mass" are molar quantities. Molarity is the concentration of a solution, expressed as the number of moles of solute per liter of solution. It is a measure of the amount of solute present in a given volume of solution. Molar mass is the mass of one mole of a substance and is typically expressed in grams per mole (g/mol). It is the sum of the atomic masses of all the atoms in a molecule of the substance. On the other hand, "Mass concentration" and "Molality" are not molar quantities. Mass concentration is the concentration of a solution, expressed as the mass of solute per unit volume of solution. Molality is the concentration of a solution, expressed as the number of moles of solute per kilogram of solvent.