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Avogadro's number, or Avogadro's constant, is the number of particles found in one mole of a substance. It is the number of atoms in exactly 12 grams ofcarbon-12. This experimentally determined value is approximately 6.0221 x 1023 particles per mole. Avogadro's number may be designated using the symbol L or NA. Note that Avogadro's number, on its own, is a dimensionless quantity.
In chemistry and physics, Avogadro's number usually refers to a quantity of atoms, molecules, or ions, but it can be applied to any "particle." For example, 6.02 x 1023 elephants is the number of elephants in one mole of them! Atoms, molecules, and ions are much less massive than elephants, so there needed to be a large number to refer to a uniform quantity of them so that they could be compared relative to each other in chemical equations and reactions.
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In chemistry and physics, Avogadro's number usually refers to a quantity of atoms, molecules, or ions, but it can be applied to any "particle." For example, 6.02 x 1023 elephants is the number of elephants in one mole of them! Atoms, molecules, and ions are much less massive than elephants, so there needed to be a large number to refer to a uniform quantity of them so that they could be compared relative to each other in chemical equations and reactions.
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