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MOLE

Mole is the amount of a substance, consisting of the number of structural elements ( atoms, molecules, ions, electrons, etc.) equal to the number of atoms in 0,012 kilograms of the carbon isotope ¹²C. The number of atoms in 0,012 kilograms of the carbon isotope ¹²C is equal to Avogadro’s number. This means that one mole of molecular oxygen consists of 6,02·10²³ molecules.