Avogadro's number

Avogadro's number, also called Avogadro's constant (NA) is a large constant used in chemistry and physics. Avogadro's number is formally defined as the number of carbon-12 atoms in 12 grams (0.012 kg) of carbon-12, which is approximately 6.022 × 1023. Historically, carbon-12 was chosen as the reference substance because its atomic mass could be measured particularly accurately.

Related Topics:
Chemistry - Physics - Carbon-12

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A mole is defined as Avogadro's number of particles of any kind of substance (atoms, ions, molecules, or formula units).

Related Topics:
Mole - Atom - Ion - Molecule - Formula unit

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