Avogadro constant or number is the number of atoms in one mole, which is equal to 6.0221415 × 10^23.
Edited to:
The Avogadro constant is the number of particles (atoms, molecules or compounds) in one mole of a substance. It is the number of atoms in exactly 12g of carbon-12. As for all other elements, one mole of those is found in the relative Atomic Mass of that substance which is calculated relative to one twelfth of a carbon-12 atom e.g. one mole of oxygen atoms is in 16g of oxygen... and a mole was experiemtally worked out to contain 6.0221415 × 10^23 particles.
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Avogadro's constant is the number of atoms or molecules of a substance in 1 mole of that substance.
Boltzmanns constant
Avogadro's number is a constant and is the same regardless of element.
A mole.
The question is about an oxymoronic expression. A constant cannot be a variable and a variable cannot be a constant!