Em tham khảo nha:
\(\begin{array}{l}
a)\\
4Fe{S_2} + 11{O_2} \xrightarrow{t^0} 2F{e_2}{O_3} + 8S{O_2}\\
F{e_2}{O_3} + 3{H_2} \xrightarrow{t^0} 2Fe + 3{H_2}O\\
BaO + {H_2}O \to Ba{(OH)_2}\\
Ba{(OH)_2} + 2HN{O_3} \to Ba{(N{O_3})_2} + 2{H_2}O\\
Ba{(N{O_3})_2} + N{a_2}S{O_4} \to BaS{O_4} + 2NaN{O_3}\\
2S{O_2} + {O_2} \xrightarrow{t^0,V_2O_5} 2S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
2NaOH + {H_2}S{O_4} \to N{a_2}S{O_4} + 2{H_2}O\\
b)\\
2Ba + {O_2} \xrightarrow{t^0} 2BaO\\
BaO + {H_2}O \to Ba{(OH)_2}\\
Ba{(OH)_2} + S{O_2} \to BaS{O_3} + {H_2}O\\
BaS{O_3} + 2HCl \to BaC{l_2} + S{O_2} + {H_2}O\\
BaO + 2HN{O_3} \to Ba{(N{O_3})_2} + {H_2}O\\
c)\\
S + {O_2} \xrightarrow{t^0}S{O_2}\\
2S{O_2} + {O_2} \xrightarrow{t^0,V_2O_5} 2S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
CuO + {H_2}S{O_4} \to CuS{O_4} + {H_2}O\\
4Fe{S_2} + 11{O_2} \xrightarrow{t^0} 2F{e_2}{O_3} + 8S{O_2}\\
S{O_2} + 2KOH \to {K_2}S{O_3} + {H_2}O\\
{K_2}S{O_3} + 2HCl \to 2KCl + S{O_2} + {H_2}O
\end{array}\)
