Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O 

3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O 

NH₄NO₃ → N₂O + 2H₂O

NH₄NO₂ → N₂ + 2H₂O

2AgNO₃ →  2Ag + O₂ + 2NO₂

Mình cám mơn ạ

Bạn xem lại PT 1 và 3 nhé.

\(\overset{0}{Al}+H\overset{+5}{N}O_3\rightarrow\overset{+3}{Al}\left(NO_3\right)_3+\overset{0}{N_2}+H_2O\)

\(\overset{0}{Al\rightarrow}\overset{+3}{Al}+3e|\times10\)

\(2\overset{+5}{N}+10e\rightarrow\overset{0}{N_2}|\times3\)

⇒ 10Al + 36HNO₃ → 10Al(NO₃)₃ + 3N₂ + 18H₂O

\(\overset{^{+2y/x}}{Fe_x}O_y+H\overset{+5}{N}O_3\rightarrow\overset{+3}{Fe}\left(NO_3\right)_3+\overset{+4}{N}O_2+H_2O\)

\(\overset{^{+2y/x}}{Fe_x}\rightarrow x\overset{+3}{Fe}+\left(3x-2y\right)e|\times1\)

\(\overset{+5}{N}+e\rightarrow\overset{+4}{N}|\times\left(3x-2y\right)\)

⇒ Fe_xO_y + (6x-2y)HNO₃ → xFe(NO₃)₃ + (3x-2y)NO₂ + (3x-y)H₂O

Mk làm ví dụ 3 ý đầu nhé mấy ý sau tương tự

MnO2+HCl\(\rightarrow\)MnCl2+Cl2+H2O

Mn⁺⁴ +2e\(\rightarrow\)Mn⁺²_____.1

2Cl^- \(\rightarrow\)Cl2+2e________.1

\(\rightarrow\)MnO2+4HCl\(\rightarrow\)MnCl2+Cl2+2H2O

Al\(\rightarrow\)Al⁺³ +3e ______.8

N⁺⁵ +8e\(\rightarrow\)N^-3______.3

\(\rightarrow\)8Al+30HNO3\(\rightarrow\)8Al(NO3)3+3NH4NO3+15H2O

6Fe+\(\frac{8}{3}\rightarrow\)6Fe⁺³ +2e ___________.3

S⁺⁶ +6e\(\rightarrow\)S⁰ ________________ .1

\(\rightarrow\)6Fe3O4+28H2SO4\(\rightarrow\)9Fe2(SO4)3+S+28H2O

giải giúp em đy chị mai e phải kiểm tra r

\(a,4Mg+10HNO_3\to 4Mg(NO_3)_2+NH_4NO_3\uparrow+3H_2O\\ b,2Fe_xO_y+(6x-2y)H_2SO_4\to xFe_2(SO_4)_3+(3x-2y)SO_2\uparrow+(6x-2y)H_2O\\ c,3Fe_xO_y+(12x-2y)HNO_3\to 3xFe(NO_3)_3+(3x-2y)NO\uparrow+(6x-y)H_2O\\ d,2FeO+4H_2SO_4\to Fe_2(SO_4)_3+SO_2\uparrow+4H_2O\\ e,3Fe_3O_4+28HNO_3\to 9Fe(NO_3)_3+NO\uparrow+14H_2O\)

a)\(3M+4nHNO_3-->3M\left(NO_3\right)_n+nNO+2nH_2O\)

b)

\(2M+2nH_2SO_4-->M_2\left(SO_4\right)_n+nSO_2+2nH_2O\)

c)

\(8M+30HNO_3-->8M\left(NO_3\right)_3+3N_2O+15H_2O\)

d)

\(8M+10nHNO_3-->8M\left(NO_3\right)_n+nN_2O+5nH_2O\)

e)\(\left(5x-2y\right)Fe+\left(15x-3y\right)HNO_3-->\left(5x-2y\right)Fe\left(NO_3\right)_3+3N_xO_y+\left(\dfrac{15x-3y}{2}\right)H_2O\)

f) \(3Fe_xO_y+\left(6x+2y\right)HNO_3-->3xFe\left(NO_3\right)_3+\left(2y-3x\right)NO+\left(3x+y\right)H_2O\)

g)\(Fe_xO_y+\left(6x-2y\right)HNO_3-->xFe\left(NO_3\right)_3+\left(3x-2y\right)NO_2+\left(3x-y\right)H_2O\) h)\(Fe_xO_y+2yHCl-->xFeCl_{\dfrac{2y}{x}}+yH_2O\)

i)\(2Fe_xO_y+2yH_2SO_4-->xFe_2\left(SO_4\right)_{\dfrac{2y}{x}}+2yH_2O\)