Em tham khảo nha:
2)
\(\begin{array}{l}
3Fe + 2{O_2} \xrightarrow{t^0} F{e_3}{O_4}\\
A:F{e_3}{O_4}\\
F{e_3}{O_4} + 8HCl \to FeC{l_2} + 2FeC{l_3} + 4{H_2}O\\
B:FeC{l_2}\\
C:FeC{l_3}\\
FeC{l_2} + 2NaOH \to Fe{(OH)_2} + 2NaCl\\
D:Fe{(OH)_2}\\
G:NaCl\\
FeC{l_3} + 3NaOH \to Fe{(OH)_3} + 3NaCl\\
3)\\
Fe + 2HCl \to FeC{l_2} + {H_2}\\
A:FeC{l_2}\\
B:{H_2}\\
FeC{l_2} + 2NaOH \to Fe{(OH)_2} + 2NaCl\\
C:Fe{(OH)_2}\\
4Fe{(OH)_2} + {O_2} + 2{H_2}O \xrightarrow{t^0} 4Fe{(OH)_3}\\
D:Fe{(OH)_3}\\
2Fe{(OH)_3} \xrightarrow{t^0} F{e_2}{O_3} + 3{H_2}O\\
E:F{e_2}{O_3}\\
F{e_2}{O_3} + 3{H_2} \xrightarrow{t^0} 2Fe + 3{H_2}O
\end{array}\)