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Avogadro constant or number is the number of atoms in one mole, which is equal to 6.0221415 × 10^23.

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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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It is 6.02214086*10^23 mol^(-1).

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Q: What is Avogadro constant?
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