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Use Avogadro's number. 2 mole Fe(3+) ( 6.022 X 10^23/1 mole Fe(3+) ) = 1.20 X 10^24 ions of Fe(3+)
Iron (Fe)
Yes
combination
CuSO4 (aq) + Fe (s) -> FeSO4 (aq) + Cu (s)