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Avogadro's Number

Avogadro's number (6.022 x 10^23) defines the number of representative particles (atoms, molecules) in one mole of a substance.
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The statement of the theorem

Define the mole (nn) as the amount of substance. Let NAN_A be Avogadro's number. The relationship between the number of particles (NN) of a substance and the amount of substance (nn) is defined by: Nn=NA\frac{N}{n} = N_A. Specifically, for any particle type (atoms, molecules), NA≈6.022×1023 particles/molN_A \approx 6.022 \times 10^{23} \text{ particles/mol}. This constant serves as the conversion factor between the particle count and the molar quantity.