What should be added to FeSO4 to get Fe2 (SO4) 3 …?

1 way: 2FeSO4 + H2SO4 + 2HNO3 => Fe2 (SO4) 3 + 2NO2 ↑ + 2H2O
Method 2. 12FeSO4 + 3O2 => Fe2 (SO4) 3 + Fe2O3
Method 3. 2FeSO4 + 2SO3 => Fe2 (SO4) 3 + SO2



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