Em tham khảo nha:
\(\begin{array}{l}
2)\\
4Fe{S_2} + 11{O_2} \xrightarrow{t^0} 2F{e_2}{O_3} + 8S{O_2}\\
2S{O_2} + {O_2} \xrightarrow{t^0,V_2O_5} 2S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
F{e_2}{O_3} + 3{H_2}S{O_4} \to F{e_2}{(S{O_4})_3} + 3{H_2}O\\
2Na + 2{H_2}O \to 2NaOH + {H_2}\\
F{e_2}{O_3} + 3{H_2} \xrightarrow{t^0} 2Fe + 3{H_2}O\\
Fe + {H_2}S{O_4} \to FeS{O_4} + {H_2}\\
FeS{O_4} + 2NaOH \to Fe{(OH)_2} + N{a_2}S{O_4}\\
4)\\
a)\\
Cu + C{l_2} \xrightarrow{t^0}CuC{l_2}\\
Cu + 2FeC{l_3} \to CuC{l_2} + 2FeC{l_2}\\
b)\\
CuC{l_2} \to Cu + C{l_2}\\
Fe + CuC{l_2} \to FeC{l_2} + Cu\\
c)\\
2Fe + 3C{l_2} \xrightarrow{t^0} 2FeC{l_3}
\end{array}\)
