Science glossary film: Avogadro's constant

Avogadro's constant

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The number of particles in 1 mole of a substance, which is 6.022 times 10 to the power of 23.

The number of particles in 1 mole of a substance, which is 6.022 times 10 to the power of 23. That’s how many particles there are in 1 mole of any pure substance, whether it’s 197 grams of gold, 12 grams of carbon, or 18 grams of water. In all of three of these samples, there are 6.022 times 10 to the power of 23 atoms or molecules. Avogadro's constant is important as it allows chemists to calculate the exact quantities of chemicals needed for a particular reaction.

That’s how many particles there are in 1 mole of any pure substance, whether it’s 197 grams of gold, 12 grams of carbon, or 18 grams of water. In all of three of these samples, there are 6.022 times 10 to the power of 23 atoms or molecules. Avogadro's constant is important as it allows chemists to calculate the exact quantities of chemicals needed for a particular reaction.

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