| − | The Molar mass is the quotient of the mass ''m'' and the fuel quantity ''n''.
| + | ''Molar mass'' is defined as mass of the substance of interest (the "solute") per unit volume of the "solvent" (whatever the substance is being measured with respect to) at a given temperature. ''Molality'' is defined as mass of solute per unit mass of the solvent, and is thus not affected by density changes. |