Em tham khảo!

$\text{3) 3Fe+2O2$\xrightarrow{t^o}$Fe3O4}$

Tỉ lệ: $\text{3:2:1}$

$\text{4) 2Al+3Cl2$\xrightarrow{t^o}$2AlCl3}$

Tỉ lệ: $\text{2:3:2}$

$\text{5) Fe3O4+8HCl$\rightarrow$2FeCl3+FeCl2+4H2O}$

Tỉ lệ: $\text{1:8:2:1:4}$

$\text{6) Fe3O4+4H2SO4$\rightarrow$Fe2(SO4)3+FeSO4+4H2O}$

Tỉ lệ: $\text{1:4:1:1:4}$

$\text{7) Al2O3+3H2SO4$\rightarrow$Al2(SO4)3+3H2O}$

Tỉ lệ: $\text{1:3:1:3}$

$\text{8) Na2CO3+2HCl$\rightarrow$2NaCl+H2O+CO2}$

Tỉ lệ: $\text{1:2:2:1:1}$

3, $\text{3Fe + 2$O_{2}$ $\longrightarrow$ $Fe_{3}$$O_{4}$ nội dung}$

4, $\text{2Al + 3$Cl_{2}$ $\longrightarrow$ 2$AlCl_{3}$ }$ 

5, $\text{$Fe_{3}$$O_{4}$ + HCl $\longrightarrow$ $FeCl_{3}$ + $FeCl_{2}$ + $H_{2}O$ }$

6, $\text{$Fe_{3}$$O_{4}$ + 8$H_{2}$$SO_{4}$ $\longrightarrow$ 2$Fe_{2}$$(SO_{4}$ $)_{3}$ + $FeSO_{4}$ + 4$H_{2}O$ }$

7, $\text{$Al_{2}$$O_{3}$ + 3$H_{2}$$SO_{4}$ $\longrightarrow$ $Al_{2}$$(SO_{4}$$)_{3}$ + 3$H_{2}O$}$

8, $\text{$Na_{2}$$CO_{3}$ + 2HCl $\longrightarrow$ 2NaCl + $CO_{2}$ + $H_{2}O$ }$

$\text{#Kudo}$