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

`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

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

\(2Na+2HCl\rightarrow2NaCl+H_2\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

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

\(2C_xH_yO_z+\dfrac{4x+y-2z}{2}O_2\underrightarrow{t^o}2xCO_2+yH_2O\)

\(2C_xH_yO+\dfrac{4x+y-2}{2}O_2\underrightarrow{t^o}2xCO_2+yH_2O\)

\(6Fe_xO_y+\left(12x-2y\right)H_2SO_{4\left(đ\right)}\underrightarrow{t^o}3xFe_2\left(SO_4\right)_3+\left(3x-2y\right)S+\left(12x-2y\right)H_2O\)

\(8Fe_xO_y+\left(30x-4y\right)HNO_3\rightarrow8xFe\left(NO_3\right)_3+\left(3x-2y\right)N_2O+\left(15x-2y\right)H_2O\)

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) \(2K+2H_2O->2KOH+H_2\)

$\rm k)2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2 \uparrow$
$\rm l)CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O$
$\rm m)2Al + 3H_2SO_4 \rightarrow Al_2(SO_4)_3 + 3H_2 \uparrow$
$\rm n)Na_2CO_3 + CaCl_2 \rightarrow CaCO_3 \downarrow + 2NaCl$
$\rm o)2Na + 2H_2O \rightarrow 2NaOH + H_2 \uparrow$
$\rm p)CaO + 2HNO_3 \rightarrow Ca(NO_3)_2 + H_2O$
$\rm q)P_2O_5 + 3H_2O \rightarrow 2H_3PO_4$
$\rm r)Zn + 2HCl \rightarrow ZnCl_2 + H_2 \uparrow$
$\rm s)4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3$
$\rm t)Ba(OH)_2 + 2HCl \rightarrow BaCl_2 + 2H_2O$

1: 2Ag + 2H2SO4 --> Ag2SO4 + SO2 + 2H2O

2: Ba(HCO3)2 + Ca(OH)2 --> BaCO3 + CaCO3 + 2H2O

3: Fe2O3 + 6HNO3 --> 2Fe(NO3)3 + 3H2O

4: 2FexOy + (3x-2y)O2 --to--> xFe2O3

5: 2KMnO4 + 16HCl --> 2KCl + 2MnCl2 + 5Cl2 + 8H2

\(2KHCO_3+Ca\left(OH\right)_2\rightarrow K_2CO_2+CaCO_3+2H_2O\)

\(Al_2O_3+6KHSO_4\rightarrow Al_2\left(SO_4\right)_3+3K_2SO_4+3H_2O\)

\(nFe_2O_3+\left(3y-2x\right)H_2\rightarrow2Fe_xO_y+\left(3y-2x\right)H_2O\)

\(2NaHSO_4+BaCO_3\rightarrow Na_2SO_4+BaSO_4+CO_2+H_2O\)

\(6H_2SO_4+2Fe\rightarrow Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\)

$\mathrm{1)\; 3M}+\mathrm{4nH}N{O}_3\to \mathrm{3M}{\left(N{O}_3\right)}_n+\mathrm{nN}O+{\mathrm{2nH}}_{2}O$

M⁰ → M⁺ⁿ + ne |3

N⁺⁵ + 3e → N⁺² | n

Tương tự:

$\mathrm{2)\; 2M}+{\mathrm{2nH}}_{2}S{O}_4\to M_2{\left(S{O}_4\right)}_n+\mathrm{nS}{O}_2+{\mathrm{2nH}}_{2}O$

$\mathrm{3)\; 8M}+\mathrm{30H}N{O}_3\to \mathrm{8M}{\left(N{O}_3\right)}_3+{\mathrm{3N}}_{2}O+{\mathrm{15H}}_{2}O$

$\mathrm{M0\; +\; 3e}$→ M⁺³ | 8

$\mathrm{2N+5\; +\; 8e}$→ N₂⁺¹O | 3

$\mathrm{4)\; 2F}{e}_x{O}_y+\mathrm{2yH2}S{O}_4\to \mathrm{xF}{e}_2{\left(S{O}_4\right)}_{\frac{2y}{x}}+{\mathrm{2yH}}_{2}O$

$P$hương trình này không phải pt oxi hóa khử nên cứ cân bằng nhẩm bình thường

$\mathrm{các\; câu\; còn\; lại\; tương\; tự}$

1)

(5x-2y)FeO+(16x-6y)HNO₃\(\rightarrow\)(5x-2y)Fe(NO₃)₃+N_xO_y+(8x-3y)H₂O

2)

(5x-2y)M+(6nx-2ny)HNO₃\(\rightarrow\)(5x-2y)M(NO₃)_n+nN_xO_y+(3nx-ny)H₂O

3)

3xFe₂O₃+(6x-4y)Al\(\rightarrow\)6Fe_xO_y+(3x-2y)Al₂O₃

4)

3Fe_mO_n+(12m-2n)HNO₃\(\rightarrow\)3mFe(NO₃)₃+(3m-2n)NO+(6m-n)H₂O

5)

(10-2x)FeS₂+(60-6x)HNO₃\(\rightarrow\)(10-2x)Fe(NO₃)₃+15N₂O_x+(10+x)H₂O+(20-4x)H₂SO₄