a) \(K_2O+H_2O->2KOH\)

b) \(2Fe+3Cl_2->2FeCl_3\)

c) \(2Al\left(OH\right)_3+3H_2SO_4->Al_2\left(SO_4\right)_3+6H_2O\)

d) \(4FeS_2+11O_2->2Fe_2O_3+8SO_2\)

e)\(2Al+6HCl->2AlCl_3+3H_2\)

f) \(2KClO_3->KCl+3O_2\)

g) \(4P+5O_2->2P_2O_5\)

h) \(3Fe+2O_2->Fe_3O_4\)

i) \(2Al+3CuSO_4->Al_2\left(SO_4\right)_3+3Cu\)

j) \(2K+2H_2O->2KOH+H_2\)

1: 2KMnO4 + 16HCl -> 2KCl + 2MnCl2 + 5Cl2 + 8H2O

2: Fe3O4 + 8HCl --> FeCl2 + 2FeCl3 + 4H2O

3: 3FexOy + 2yAl --> 3xFe + yAl2O3

4: 2FexOy + (6x-2y)H2SO4 --> xFe2(SO4)3 + (3x-2y)SO2 + (6x-2y)H2O

5: FexOy + yH2 --> xFe + yH2O

PTHH (1), (2), (3), (5), (8) đã cân bằng

\(\left(4\right)Ca\left(OH\right)_2+H_2SO_4\rightarrow CaSO_4+2H_2O\)

\(\left(6\right)Al\left(OH\right)_3+3HCl\rightarrow AlCl_3+3H_2O\)

\(\left(7\right)MnO_2+4HCl\rightarrow MnCl_2+Cl_2+2H_2O\)

\(\left(9\right)P_2O_5+3H_2O\rightarrow2H_3PO_4\)

\(\left(10\right)2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)

CaO + CO₂ → CaCO₃

CaO + H₂O → Ca(OH)₂

CaCO₃ + H₂O + CO₂ → Ca(HCO₃)₂

Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O

Fe + H₂SO₄ → FeSO₄ + H₂

2Al(OH)₃ + 6HCl → 2AlCl₃ + 6H₂O

MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O

H₂SO₄ + Na₂CO₃ → Na₂SO₄ + CO₂ + H₂O

P₂O₅ + 3H₂O → 2H₃PO₄

2Fe(OH)₃ \(\underrightarrow{to}\) Fe₂O₃ + 3H₂O

`Fe + 2HCl -> FeCl_2 + H_2`

`2Na + 2HCl -> 2NaCl + H_2`

`2Al + 6HCl -> 2AlCl_3 + 3H_2`

`2Al(OH)_3 + 3H_2SO_4 -> Al_2(SO_4)_3 + 6H_2O`

Fe + 2HCl → FeCl₂ + H₂
2Na + 2HCl → 2NaCl + H₂
2Al + 6HCl → 2AlCl₃ + 3H₂
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O

Mới lớp 8 mà cân bằng electron rồi à bạn :3

a) 1:2:1:2:2

b) 1:2:1:1:2

c) 2:16:2:2:5:8

d) 10:2:8:5:1:2:8

e) 8:30:8:3:9

Cân bằng các PTHH sau :

a) ${\left(N{H}_4\right)}_{2}C{O}_3+2NaOH\to N{a}_{2}C{O}_3+2N{H}_3+2H_{2}O$

b)$Cu+2H_{2}S{O}_4\to CuS{o}_4+S{O}_2+2H_{2}O$

c)2 $KMn{O}_4+16HCl\to 2KCl+2MnC{l}_2+5C{l}_2+8H_{2}O$

d)10$FeS{O}_4+2KMn{O}_4+8H_{2}S{O}_4\to F{e}_2{\left(S{O}_4\right)}_3+2K_{2}S{O}_4+8MnS{O}_4+{\mathrm{H2}}^{}O$

e)8$Al+30HN{O}_3\to 8Al{\left(N{O}_3\right)}_3+3N{H}_{4}N{O}_3+9H_{2}O$

1) 2

2) C_nH_{2n + 2} + \(\dfrac{3n+1}{2}\) O₂ -> nCO₂ + (n+1)H₂O.

3) C_nH_{2n – 2} + \(\dfrac{3n-1}{2}\) O₂ -> nCO₂ +(n-1) H2O.

4) C_nH_2n-6 +\(\dfrac{3n-3}{2}\) O2 -> nCO2 + (n-3) H2O

5) O+\(\dfrac{3n}{2}\)O2→n+(n+1)H2O

6) 2C_xH_yO_z + \(\dfrac{4x+y-2z}{2}\) O2 →2x CO₂ + yH₂O

7)

Cô có chỉnh sửa đề 1 chút cho phù hợp

\(\dfrac{4x+v-2z}{2}\)2xCO₂ + vH₂O

C_xHyO_Z +(x+y/4-z/2) O_{2 -> x}CO2 +y/2 H₂O

1. \(4P+5O_2\rightarrow2P_2O_5\)

2. \(N_2+3H_2\rightarrow2NH_3\)

4. \(Fe+2HCl\rightarrow FeCl_2+H_2\)

3. \(2Al+6HCl\rightarrow2AlCl_2+H_2\)

5. \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)

6. \(Fe_3O_4+4H_2\rightarrow3Fe+4H_2O\)

7. \(2Fe+3Cl_2\rightarrow2FeCl_3\)

8. \(2Al+3S\rightarrow Al_2S_3\)

9. \(2Al_2O_3\rightarrow4Al+3O_2\)

1. 4P+5O2→2P2O5

2. N2+3H2→2NH3

4. Fe+2HCl→FeCl2+H2

3. 2Al+6HCl→2AlCl2+H2

5. Fe2O3+3H2SO4→Fe2(SO4)3+3H2O

6. Fe3O4+4H2→3Fe+4H2O

7. 2Fe+3Cl2→2FeCl3

8. 2Al+3S→Al2S3

9. 2Al2O3→4Al+3O2

PTHH 1: N₂ + 3H₂ -t^o;xúc tác Fe,Pt; áp suất-> 2NH₃

PTHH 2: 2H₂S + 3O₂ -t^o-> 2SO₂ + 2H₂O

PTHH 3: 4FeS₂ + 11O₂ -t^o-> 2Fe₂O₃ + 8SO₂

PTHH 4: Fe₃O₄ + 8HCl -t^o-> 2FeCl₃ + FeCl₂ + 4H₂O