Definition:Avogadro's Constant

Definition
Avogadro's constant is defined as the number of particles in a mole, expressed in a form where its unit of measurement is the reciprocal mole.

Hence its value is defined as:
 * $6 \cdotp 02214 076 \times 10^{23} \, \mathrm {mol^{-1} }$

Also see

 * Definition:Avogadro's Number