? (1) The basic unit of the quantity of any material shall be the mole.
(2) Mole means the quantity of the system in which there exist as
many elementary entities as there are atoms in 0.012 kilogram of Carbon
Explanation: While using moles, there must be a clear mention of
elementary entities which may be in the form of molecules, atoms,
ions, electrons, or other particles or groups of prescribed particles.