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1, 4Mg+ 10HNO3 ------> 4Mg(NO3)2+N2O + 5H2O
2, 10Al+ 36HNO3 ------>10Al(NO3)3+3N2+ 18H2O
3, 4Mg+ 10HNO3 --------> 4Mg(NO3)2+NH4NO3+ 3H2O
4, 3Fe3O4+ 28HNO3 ------->.9Fe(NO3)3+NO + 14H2O
5, 2FeS+ 10H2SO4 đặc------> Fe2(SO4)3 + 9SO2 + 10H2O
6, FeS2+ 18HNO3 đặc -------> Fe(NO3)3 + 15NO2 + 2H2SO4 + 7H2O
7Mg + 20HNO3 → 7Mg(NO3)2 + 4NO + 2NO2 +10H2O
Cách: cân bằng bt thôi nha
4 ý cuối :
1)
Cu + 2H2SO4→ CuSO4+ SO2+2H2O
Cu0 →Cu+2 +2e║ x1
S+6+2e →S+4 ║ x1
2)
2Al+ 4H2SO4→ Al2(SO4)3+ S+ 4H2O
2Al0→2Al+3 +6e║x1
S+6 +6e→S0 ║x1
3)
4Zn +5H2SO4→ 4ZnSO4+ H2S+ 4H2O
Zn0\(\rightarrow\) Zn+2 +2e ║x4
S+6 +8e →S−2 ║x1
4)
8Fe+ 15H2SO4→ 4Fe2(SO4)3+3H2S+ 12H2O
2Fe0→ 2Fe+3+6e║x4
S+6 +8e →S−2 ║x3
6 ý đầu
1.\(\overset{-3}{4NH_2}+\overset{0}{5O_2}\rightarrow\overset{+2+6}{4NO}+\overset{-2}{6H_2O}\)
4 X \(||\) N-3 + 5e → N+2
5 X \(||\) 2O0 + 4e → 2O-2
2.\(\overset{-3}{4NH3}+\overset{0}{3O_2}\rightarrow\overset{0}{2N_2}+\overset{-2}{6H_2O}\)
2 X \(||\) 2N-3 + 6e → 2N0
3 X \(||\) 2O0 + 4e → 2O-2
3.\(\overset{0}{3Mg}+\overset{+5}{8NO_3}\rightarrow\overset{+2}{3Mg\left(NO_3\right)_2}+\overset{+2}{2NO}+\overset{ }{4H_2O}\)
3 X \(||\) Mg0 → Mg+2 + 2e
2 X \(||\) N+5 + 3e → N+2
4.\(\overset{0}{Al}+\overset{+5}{6NO_3}\rightarrow\overset{+3}{Al\left(NO_3\right)_3}+\overset{+4}{3NO_2}+\overset{ }{3H_2O}\)
1 X \(||\) Al0 → Al+3 + 3e
3 X \(||\) N+5 + 1e → N+4
5.\(\overset{0}{Zn}+\overset{+5}{4HNO_3}\rightarrow\overset{+3}{Fe\left(NO_3\right)_3}+\overset{+2}{NO}+\overset{ }{2H_2O}\)
1 X \(||\) Zn0 → Mg+2 + 2e
2 X \(||\) N+5 + 3e → N+4
6.\(\overset{0}{Fe}+\overset{+5}{4HNO_3}\rightarrow\overset{+3}{Fe\left(NO_3\right)_3}+\overset{+2}{NO}+\overset{ }{2H_2O}\)
1 X \(||\) Fe0 → Fe+3 + 3e
1 X \(||\) N+5 + 3e → N+2
a) 1x 2FeS2 → 2Fe+3 + 4S+4 + 22e
11x S+6 + 2e → S+4
→ 
b) 13x Mg0 → Mg2+ + 2e
1x 5N+5 + 26e → 2N+ + N20 + N-3
→ 13Mg + 32HNO3 → 13Mg(NO3)2 + N2O + N2 + NH4NO3 + 14 H2O
c) (5x-2y) x 3Fe+8/3 → 3Fe+3 + 1e
1x xN+5 + (5x-2y)e → xN+2y/x
→ (5x-2y) Fe3O4 + (46x-18y)HNO3 → NxOy + (15x-6y)Fe(NO3)3 + (23x-9y)H2O
d) 8 Al → Al+3 + 3e
3 N+5 + 8e → N-3
→ 8Al + 3NaNO3 + 5NaOH + 2H2O → 8NaAlO2 + 3NH3
HD:
a)
FeS - 9e = Fe+3 + S+6
N+5 + 3e = N+2
------------------------------------
FeS + 3N+5 = Fe+3 + S+6 + 3N+2
FeS + 6HNO3 ---> Fe(NO3)3 + H2SO4 + 3NO + 2H2O
b)
Fe+3 + e = Fe+2
2I- -2e = I2
-------------------------
2Fe+3 + 2I- = 2Fe+2 + I2
2FeCl3 + 2KI ---> 2FeCl2 + I2 + 2KCl
(1) Cu2S:
(Cu2S) --> 2Cu(+2) + S(+6) + 10e; N(+5) + 3e --> N(+2)
--> 3Cu2S + 22HNO3 --> 6Cu(NO3)2 + 3H2SO4 + 10NO + 8H2O (a)
(2) FeS2:
(FeS2) --> Fe(+3) + 2S(+6) + 15e; N(+5) +3e --> N(+2)
--> FeS2 + 8HNO3 --> Fe(NO3)3 + 2H2SO4 + 5NO + 2H2O (b)
Công 2 phản ứng (a) + 3(b) (nhân 3 vào hệ số của pư b để cân bằng)
--> 6FeS2.Cu2S + 46HNO3 --> 3Fe(NO3)3 + 6Cu(NO3)2 + 9H2SO4 + 25NO + 14H2O
PTHH: 7Mg + 20HNO3 → 7Mg(NO3)2 + 4NO + 2NO2 +10H2O
Mg\(\rightarrow\)Mg+2 +2e
N+5+4e \(\rightarrow\)NO+NO2
2Mg+6HNO3\(\rightarrow\)2Mg(NO3)2+NO+NO2+3H2O