Correct Answer: Molar mass

Solution : The correct option is Molar mass

Molar mass is measured in grams per mole (g/mol) and reflects the mass of one mole of that substance's entities (atoms, molecules, and ions). It is a crucial concept in chemistry for various calculations , such as measuring the mass or number of moles of a specific amount of a substance. It is quantitatively equal to the material's molecular or atomic weight. One mole of a particular substance has a fixed mass. Wilhelm Ostwald first used the term "mole."