Avogadro's Number Calculator
Convert moles to particles (atoms, molecules, ions) using 6.022 x 10^23.
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Enter the number of moles. The calculator multiplies by Avogadro's number (6.022 x 10^23) to give the total number of particles. This works for atoms, molecules, ions, or any countable entity.
About the Avogadro's Number Calculator
Avogadro's number is one of the fundamental constants of chemistry. It defines the mole as containing exactly 6.02214076 x 10^23 elementary entities. Named after Amedeo Avogadro, this constant bridges the gap between atomic-scale measurements and laboratory-scale quantities.
Frequently Asked Questions
What is Avogadro's number?
Avogadro's number (NA) is exactly 6.02214076 x 10^23 particles per mole. It was defined in 2019 by the SI as an exact value, replacing the older experimentally measured value. It connects the mole unit to the actual count of atoms or molecules.
Does it apply to atoms, molecules, and ions equally?
Yes. One mole of anything contains 6.022 x 10^23 of that thing. One mole of carbon atoms is 6.022 x 10^23 atoms. One mole of water molecules is 6.022 x 10^23 molecules. One mole of Na+ ions is 6.022 x 10^23 ions.
How large is a mole?
A mole is an astronomically large number. If you had a mole of grains of sand, it would be roughly 1000 times the mass of Earth. One mole of seconds is about 19 quadrillion years, far longer than the age of the universe.