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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.
Lab 1: Determination of Avogadroâs Number. Avogadroâs number is considered one of the few fundamental constants in chemistry. By definition, it is the number of Carbon atoms in exactly 12 grams of carbon. A mole of any substance contains an extremely large number of particles and will always be equal to the molar mass of the substance or element. There are over twenty different methods used to determine the value of Avogadroâs number.