1. 3FeO + 10HNO3-> 3Fe(NO3)3 + NO + 5H2O

2. 3Fe3O4 + 28HNO3->3 Fe(NO3)3 + NO + 14H2O

3.3 Cu + 2KNO3 + 4H2SO4->3 CuSO4 + 2NO + K2SO4 + 4H2O

4. 3CuFeS2 +8 Fe2(SO4)3 +8 O2 +8 H2O-> 3CuSO4 + 19FeSO4 + 8H2SO4

1,

2,

3,Cu+2H2SO4→2H2O+SO2+CuSO4

4,Fe+4HNO3→2H2O+NO+Fe(NO3)3

5,

6,4 Zn0 + 5 H2SO4 → 4 ZnSO4 + H2S + 4 H2O

7,4Mg + 10HNO3->4Mg(NO3)2 + NH4NO3 + 3H2O

8,2 KMnO4 + K2SO3 + 2 KOH → 2 K2MO2O4 + K2SO4 + H2O

9,2 KMnO4 + 10 FeSO4 + 8 H2SO4 → 2 Mn(SO4) + 5 Fe2(SO4)3 +K2SO4 + 8 H2O

11 câu?

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

10FeSO4 + 2KMnO4 + 8H2SO4 ➞ 5Fe2(SO4)3 + 2MnSO4 + K2SO4 + 8H2O

10FeSO₄ + 2KMnO₄ + 8H ₂SO₄ → 5Fe₂(SO₄)₃ + 5MnSO₄ + K₂SO₄+8H₂O

1, 4

2, 2

3, 8

4,

5, 8

6, 10

1) Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O

2) Al + 4HNO₃ → Al(NO₃)₃ + NO + 2H₂O

3) Al + 6HNO₃ → Al(NO₃)₃ + 3NO₂ + 3H₂O

4) 2Fe + 6H₂SO₄ → Fe₂(SO₄)₃ + 3SO₂ + 6H₂O

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

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) \(\overset{+2}{Fe}\overset{-1}{S_2}+\overset{0}{O_2}\rightarrow\overset{+3}{Fe_2}\overset{-2}{O_3}+\overset{+4}{S}\overset{-2}{O_2}\)

quá trình OXH :\(\overset{+2}{Fe}\overset{-1}{S_2}\rightarrow\overset{+3}{Fe}+\overset{+4}{2S}+11e|\times4\)

quá trình khử : \(\overset{0}{2O}+2.2e\rightarrow\overset{-2}{2O}|\times11\)

2) \(\overset{+2}{Fe}\overset{-2}{S}+H\overset{+5}{N}O_3\rightarrow\overset{+3}{Fe}\left(\overset{+5}{N}O_3\right)_3+\overset{+2}{N}\overset{-2}{O}+H_2O+H_2\overset{+6}{S}O_4\)

quá trình OXH : \(\overset{+2}{Fe}\overset{-2}{S}\rightarrow\overset{+3}{Fe}+\overset{+6}{S}+9e|\times1\)

quá trình khử : \(\overset{+5}{N}+3e\rightarrow\overset{+2}{N}|\times3\)

\(\Rightarrow FeS+6HNO_3\rightarrow Fe\left(NO_3\right)_3+3NO+2H_2O+H_2SO_4\)

CÒN ĐỂ CHIỀU MK LM CHO NHA

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