The definition of the mole is
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the amount of any substance which occupies a volume of 24 dm³ at room temperature and pressure
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the amount of any substance containing the same number of identical entities as there are in exactly 12 g of the carbon-12 isotope
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the number of atoms in exactly 12 g of the carbon-12 isotope
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the number of molecules in exactly 2 g of hydrogen at room temperature and pressure
📝 Detailed explanation
One mole contains the same number of entities as the number of atoms in exactly 12 g of carbon-12.
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