1) Fe -> Fe2O3 -> Fe(OH)3 -> Fe2(SO4)3 -> Fe2O3 -> FeCl3
4Fe +3 O2 =2 Fe2O3
Fe2O3 + 3H2O ->2 Fe(OH)3
2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O
Fe2(SO4)3 -> Fe2O3 + 3SO3
Fe2O3 + 6HCl -> 2FeCl3 + 3H2O
2) Na-> Na2O -> NaOH -> NaCl -> AgCl
4Na + O2 = 2Na2O
Na2O + H2O -> 2NaOH
NaOH + HCl = NaCl + H2O
NaCl + AgNO3 = NaNO3 + AgCl