Câu 1 nha bạn.

Em tham khảo nha:

\(\begin{array}{l}
1)\\
a)\\
2Fe + 3C{l_2} \to 2FeC{l_3}\\
Fe:C{l_2}:FeC{l_3} = 2:3:2\\
b)\\
2Cu + {O_2} \xrightarrow{t^0} 2CuO\\
Cu:{O_2}:CuO = 2:1:2\\
c)\\
2K + 2{H_2}O \to 2KOH + {H_2}\\
K:{H_2}O:KOH:{H_2} = 2:2:2:1\\
d)\\
2KOH + CuC{l_2} \to Cu{(OH)_2} + 2KCl\\
KOH:CuC{l_2}:Cu{(OH)_2}:KCl = 2:1:1:2\\
e)\\
4Al + 3{O_2} \xrightarrow{t^0} 2A{l_2}{O_3}\\
Al:{O_2}:A{l_2}{O_3} = 4:3:2\\
2)\\
a)\\
N{a_2}O + {H_2}O \to 2NaOH\\
N{a_2}O:{H_2}O:NaOH = 1:1:2\\
b)\\
{K_2}O + {H_2}O \to 2KOH\\
{K_2}O:{H_2}O:KOH = 1:1:2\\
c)\\
Ba + 2{H_2}O \to Ba{(OH)_2} + {H_2}\\
Ba:{H_2}O:Ba{(OH)_2}:{H_2} = 1:2:1:1\\
d)\\
Zn{(OH)_2} + 2HCl \to ZnC{l_2} + 2{H_2}O\\
Zn{(OH)_2}:HCl:ZnC{l_2}:{H_2}O = 1:2:1:2\\
e)\\
2NaOH + ZnC{l_2} \to Zn{(OH)_2} + 2NaCl\\
NaOH:ZnC{l_2}:Zn{(OH)_2}:NaCl = 2:1:1:2
\end{array}\)