The number of moles of iron in which 4.02×10²³ atoms are present is 0.66 mole.
Avogadro's number is the number of atoms which are present in 1 mole of any substance and it is equal to 6.022×10²³.
i.e. 1 mole = 6.022×10²³ atoms/ mole
Given atoms of iron = 4.02×10²³ atoms
Moles of iron will be calculated as:
Moles of Fe = 4.02×10²³ atoms / 6.022×10²³ atoms/mole
Moles = 0.66 moles
Hence required moles of iron is 0.66 moles.
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