Bài 3 trang 202 SGK hóa học 12 nâng cao

$ \eqalign{
& 1, 3Fe + 2{O_2}\buildrel {t_{}^0} \over
\longrightarrow F{e_3}{O_4}. \cr
& 2, 3F{e_3}{O_4} + 8Al\buildrel {t_{}^0} \over
\longrightarrow 4A{l_2}{O_3} + 9Fe \cr
& 3, Fe{\rm{ }} + {\rm{ }}4HNO_3^{}\buildrel {} \over
\longrightarrow Fe{\left( {N{O_3}} \right)_3} + NO \uparrow + 2H_2^{}O \cr
& 4, Fe + {H_2}O\buildrel {{t^0} > {{570}^0}C} \over
\longrightarrow FeO + {H_2} \cr
& 5, FeO + 2HCl\buildrel {} \over
\longrightarrow FeC{l_2} + {H_2}O \cr
& 6, 2FeC{l_2} + C{l_2}\buildrel {t_{}^0} \over
\longrightarrow 2FeC{l_3}. \cr
& 7, FeC{l_3} + 3NaOH\buildrel {} \over
\longrightarrow Fe{\left(OH\right)_3} \downarrow + 3NaCl \cr
& 8, 2Fe{\rm{ }} + {\rm{ }}6{H_2}SO_{4\text{ đặc nóng}} \Rightarrow F{e_2}{\left( {S{O_4}} \right)_3} + {\rm{ }}3S{O_2} + {\rm{ }}6{H_2}O. \cr
& 9, Fe + F{e_2}{\left(S{O_4}\right)_3}\buildrel {} \over
\longrightarrow 3FeS{O_4}. \cr
& 10, FeS{O_4} + 2NaOH\buildrel {} \over
\longrightarrow Fe{\left(OH\right)_2} \downarrow + N{a_2}S{O_4}. \cr
& 11, 4Fe{\left(OH\right)_2} + {O_2} + 2{H_2}O\buildrel {} \over
\longrightarrow 4Fe{\left(OH\right)_3}. \cr} $