"Feel quanty" made no sense at all, and "fuel quantity" still makes no sense. This version isn't very good, but I think at least it isn't misleading.
====Molar mass====
The ''Molar mass '' is defined as mass of the quotient substance of interest (the mass ''m'' and "solute") per unit volume of the fuel quantity "solvent" (whatever the substance is being measured with respect to) at a given temperature. ''nMolality''is defined as mass of solute per unit mass of the solvent, and is thus not affected by density changes.
