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Avogadro's Number Definition - Avogadro's Number is the number of atoms or molecules that are contained in a unit mole of a substance. Since this... Avogadro's Number Definition - Avogadro's Number is the number of atoms or molecules that are contained in a unit mole of a substance. Since this value remains constant for all the elements, it is also known as Avogadro constant. It is generally represented as the number of particles that are contained in one mole.
Define Avogadro's number and explain why it is important to know. 1  Define the mole. Be able to calculate the number of moles in a given mass of a substance, or the mass corresponding to a given number of moles. 2  Define molecular weight, formula weight, and molar mass; explain how the latter differs from the first two.