Em tham khảo nha:
\(\begin{array}{l}
(1)\,4Fe{S_2} + 11{O_2} \xrightarrow{t^0} 2F{e_2}{O_3} + 8S{O_2}\\
A:S{O_2}\\
(2)\,2S{O_2} + {O_2} \xrightarrow{t^0,V_2O_5} 2S{O_3}\\
B:S{O_3}\\
(3)\,S{O_2} + 2NaOH \to N{a_2}S{O_3} + {H_2}O\\
(4)S{O_3} + {H_2}O \to {H_2}S{O_4}\\
(5)\,2Fe + 6{H_2}S{O_4} \to F{e_2}{(S{O_4})_3} + 3S{O_2} + 6{H_2}O\\
(6)\,S{O_2} + NaOH \to NaHS{O_3}\\
D:NaHS{O_3}\\
(7)\,NaHS{O_3} + NaOH \to N{a_2}S{O_3} + {H_2}O\\
(8)\,N{a_2}S{O_3} + 2HCl \to 2NaCl + S{O_2} + {H_2}O\\
(9)\,{H_2}S{O_4} + 2NaOH \to N{a_2}S{O_4} + 2{H_2}O\\
E:N{a_2}S{O_4}\\
(10)N{a_2}S{O_4} + BaC{l_2} \to BaS{O_4} + 2NaCl
\end{array}\)
