Mole (unit) - Wikipedia
https://en.wikipedia.org/wiki/Mole_(unit)The mole (symbol: mol) is the base unit of amount of substance in the International System of Units (SI). It is defined as exactly 6.022 140 76 × 10 23 elementary entities ("particles"), which may be atoms, molecules, ions, or electrons.. The definition of mole was adopted in November 2018 as one of the seven SI base units, revising the previous definition that specified one mole as …