What are moles? Moles are unit of measurement for chemicals, just like grams is a unit for weight. A mole is a quantity of a chemical that contains 6.02*10^23.This number was determined by an Italian chemist named Amedeo Avogadro, so we call that number 6.02*10^23. In a chemical equation, moles are used to show how much of a chemical is needed to balance an equation. A mole is the atomic weight of a molecule of a chemical in grams. For example, a mole of oxygen(O) is 16 grams because its atomic weight is 16, and a mole of water(H2O) is 18 grams.
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