). The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012
kilogram of carbon-12. When the mole is used, the elementary entities must be specified and
may be atoms, molecules, ions, electrons, other particles, or specified groups of
such particles.
Source:
PAC, 1996, 68, 957
(Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations
1996))
on page 983