Answer: a mole
Avogadro's number [tex]N_ {A}[/tex] is determined by the number of particles (or atoms) in a mole:
[tex]N_{A}=6.0221(10)^{23}/mol[/tex]
It should be noted that the mole is one of the seven fundamental units of the International System of Units and defines the amount of substance.
Therefore:
Avogadro’s number was calculated by determining the number of atoms in a mole.
