Em tham khảo nha :
\(\begin{array}{l}
a)\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
BaO + {H_2}O \to Ba{(OH)_2}\\
b)\\
A{l_2}{O_3} + 3{H_2}S{O_4} \to A{l_2}{(S{O_4})_3} + 3{H_2}O\\
BaO + {H_2}S{O_4} \to BaS{O_4} + {H_2}O\\
Fe + {H_2}S{O_4} \to FeS{O_4} + {H_2}\\
2NaOH + {H_2}S{O_4} \to N{a_2}S{O_4} + 2{H_2}O\\
Cu{(OH)_2} + {H_2}S{O_4} \to CuS{O_4} + 2{H_2}O\\
F{e_2}{O_3} + 3{H_2}S{O_4} \to F{e_2}{(S{O_4})_3} + 3{H_2}O\\
c)\\
A{l_2}{O_3} + 2KOH \to 2KAl{O_2} + {H_2}O\\
2KOH + S{O_3} \to {K_2}S{O_4} + {H_2}O\\
HCl + KOH \to KCl + {H_2}O\\
d)\\
BaO + C{O_2} \to BaC{O_3}\\
2NaOH + C{O_2} \to N{a_2}C{O_3} + {H_2}O
\end{array}\)