Em tham khảo nha:
\(\begin{array}{l}
3a)\\
2{H_2}S + S{O_2} \to 3S + 2{H_2}O\\
S + Fe \to FeS\\
FeS + 2HCl \to FeC{l_2} + {H_2}S\\
2{H_2}S + 3{O_2} \to 2S{O_2} + 2{H_2}O\\
S{O_2} + B{r_2} + 2{H_2}O \to 2HBr + {H_2}S{O_4}\\
2S{O_2} + {O_2} \to 2S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
N{a_2}S{O_3} + {H_2}S{O_4} \to N{a_2}S{O_4} + S{O_2} + {H_2}O\\
S{O_2} + 2{H_2}S \to 3S + 2{H_2}O\\
3b)\\
a)\\
4Fe{S_2} + 11{O_2} \to 2F{e_2}{O_3} + 8S{O_2}\\
S{O_2} + {H_2}O \to {H_2}S{O_3}\\
{H_2}S{O_3} + 2KOH \to {K_2}S{O_3} + 2{H_2}O\\
{K_2}S{O_3} + 2HCl \to 2KCl + S{O_2} + {H_2}O\\
S{O_2} + 2{H_2}S \to 3S + 2{H_2}O\\
S + {H_2} \to {H_2}S\\
b)\\
Mn{O_2} + 4HCl \to MnC{l_2} + C{l_2} + 2{H_2}O\\
2Fe + 3C{l_2} \to 2FeC{l_3}\\
FeC{l_3} + 3NaOH \to 3NaCl + Fe{(OH)_3}\\
2NaCl + {H_2}S{O_4} \to N{a_2}S{O_4} + 2HCl\\
CuO + 2HCl \to CuC{l_2} + {H_2}O\\
CuC{l_2} + 2AgN{O_3} \to 2AgCl + Cu{(N{O_3})_2}\\
4)\\
4Fe{S_2} + 11{O_2} \to 2F{e_2}{O_3} + 8S{O_2}\\
2S{O_2} + {O_2} \to 2S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}
\end{array}\)
