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Câu hỏi: Viết phương trình hóa học của các phản ứng trong quá trình chuyển đổi sau:
$\begin{gathered}
Fe{S_2}\xrightarrow{{\left(1\right)}}F{e_2}{O_3}\xrightarrow{{\left(2\right)}}FeC{l_3}\xrightarrow{{\left(3\right)}}Fe{\left(OH\right)_3} \hfill \\
\xrightarrow{{\left(4\right)}}F{e_2}{O_3}\xrightarrow{{\left(5\right)}}FeO\xrightarrow{{\left(6\right)}}FeS{O_4}\xrightarrow{{\left(7\right)}}Fe \hfill \\
\end{gathered} $
$\begin{gathered}
Fe{S_2}\xrightarrow{{\left(1\right)}}F{e_2}{O_3}\xrightarrow{{\left(2\right)}}FeC{l_3}\xrightarrow{{\left(3\right)}}Fe{\left(OH\right)_3} \hfill \\
\xrightarrow{{\left(4\right)}}F{e_2}{O_3}\xrightarrow{{\left(5\right)}}FeO\xrightarrow{{\left(6\right)}}FeS{O_4}\xrightarrow{{\left(7\right)}}Fe \hfill \\
\end{gathered} $
$\begin{gathered}\left(1\right)4Fe{S_2} + 11{O_2}\xrightarrow{{{t^o}}}2F{e_2}{O_3} + 8S{O_2} \hfill \\ \left(2\right)F{e_2}{O_3} + 6HCl \Rightarrow 2FeC{l_3} + 3{H_2}O \hfill \\
\left(3\right)FeC{l_3} + 3NaOH \Rightarrow Fe{\left(OH\right)_3} + 3NaCl \hfill \\
\left(4\right) 2Fe{\left(OH\right)_3}\xrightarrow{{{t^o}}}F{e_2}{O_3} + 3{H_2}O \hfill \\
\left(5\right)F{e_2}{O_3} + {H_2}\xrightarrow{{{t^o}}}2FeO + {H_2}O \hfill \\
\left(6\right)FeO + {H_2}S{O_4} \Rightarrow FeS{O_4} + {H_2}O \hfill \\ \left(7\right)FeS{O_4} + Mg \Rightarrow MgS{O_4} + Fe \hfill \\\end{gathered}$
\left(3\right)FeC{l_3} + 3NaOH \Rightarrow Fe{\left(OH\right)_3} + 3NaCl \hfill \\
\left(4\right) 2Fe{\left(OH\right)_3}\xrightarrow{{{t^o}}}F{e_2}{O_3} + 3{H_2}O \hfill \\
\left(5\right)F{e_2}{O_3} + {H_2}\xrightarrow{{{t^o}}}2FeO + {H_2}O \hfill \\
\left(6\right)FeO + {H_2}S{O_4} \Rightarrow FeS{O_4} + {H_2}O \hfill \\ \left(7\right)FeS{O_4} + Mg \Rightarrow MgS{O_4} + Fe \hfill \\\end{gathered}$