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The Avogadro constant is defined as the number of particles in 12 g of the carbon-12 isotope.
The mole (symbol mol) is the SI base unit of amount of substance.
The empirical formula of a compound is the chemical formula that gives the actual number of atoms of each element in 1 molecule of the compound.
The relative atomic mass of iron is 56. Therefore, the molar mass of iron is 56 g/mol
The relative atomic mass of oxygen is 16. Therefore, the molar mass of oxygen gas is 16 g/mol