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Đề bài

\(\begin{gathered}
Fe{S_2}\xrightarrow{{(1)}}F{e_2}{O_3}\xrightarrow{{(2)}}FeC{l_3}\xrightarrow{{(3)}}Fe{(OH)_3} \hfill \\
\xrightarrow{{(4)}}F{e_2}{O_3}\xrightarrow{{(5)}}FeO\xrightarrow{{(6)}}FeS{O_4}\xrightarrow{{(7)}}Fe \hfill \\
\end{gathered} \)

Hướng dẫn giải

\(\eqalign{
& \left( 1 \right)4Fe{S_2} + 11{O_2} \to 2F{e_2}{O_3} + 8S{O_2} \uparrow \cr
& \left( 2 \right)F{e_2}{O_3} + 6HCl \to 2FeC{l_3} + 3{H_2}O \cr
& \left( 3 \right)FeC{l_3} + 3NaOH \to Fe{\left( {OH} \right)_3} \downarrow + 3NaCl \cr
& \left( 4 \right)2Fe{\left( {OH} \right)_3}\buildrel {{t^0}} \over
\longrightarrow 2F{e_2}{O_3} + 3{H_2}O \cr
& \left( 5 \right)F{e_2}{O_3} + 3CO\buildrel {{t^0}} \over
\longrightarrow 2FeO + 3C{O_2} \uparrow \cr
& \left( 6 \right)FeO + {H_2}S{O_4} \to FeS{O_4} + {H_2}O \cr
& \left( 7 \right)Mg + FeS{O_4} \to MgS{O_4} + Fe \downarrow \cr} \)