làm giúp mk bài 7 vs ạ

\(\begin{array}{l}
2NaCl + 2{H_2}O \to 2NaOH + C{l_2} + {H_2}\\
C{l_2} + S{O_2} + 2{H_2}O \to 2HCl + {H_2}S{O_4}\\
2Fe + 3C{l_2} \to 2FeC{l_3}\\
2FeC{l_3} + Fe \to 3FeC{l_2}\\
Fe + {H_2}S{O_4} \to FeS{O_4} + {H_2}\\
2Fe + 6{H_2}S{O_4}(dn) \to F{e_2}{(S{O_4})_3} + 3S{O_2} + 6{H_2}O
\end{array}\)