1) FeCl₂ + 2NaOH \(\rightarrow\) Fe(OH)₂ + 2NaCl

2) 2Fe(OH)₃ \(\rightarrow\) Fe₂O₃ + 3H₂O

3) 4NH₃ + 3O₂ \(\rightarrow\) 2N₂ + 6H₂O

4) Na₂SO₃ + 2HCl \(\rightarrow\) 2NaCl + SO₂ + H₂O (Bạn chép sai đề nhé!)

5) 2H₂S + 3O₂ \(\rightarrow\) 2SO₂ + 2H₂O

1) FeCl₂ + 2NaOH -Dung môi trong môi trường N2-> Fe(OH)₃ + 2NaCl

2) 2Fe(OH)₃ -t^o> Fe₂O₃ + 3H₂O

3) 2NH₃ + \(\frac{3}{2}\)O₂ -t^o-> N₂ + 3H₂O

4) NaSO₃ + 2HCl -> 2NaCl + SO₂ + H₂O

5) 2H₂S + 3O₂ -t^o> 2SO₂ + 2H₂O

Lưu ý: Bạn chú ý những đều kiện cho phản ứng xảy ra mình đã làm nha.

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. 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?

a) \(N_2+O_2\rightarrow2NO\)

\(\begin{matrix}N^0\rightarrow N^{+2}+2e\\O^0+2e\rightarrow O^{-2}\end{matrix}|\begin{matrix}\times1\\\times1\end{matrix}\)

b) \(C_2H_5OH+3O_2\rightarrow2CO_2+3H_2O\)

\(\begin{matrix}C^{-2}\rightarrow C^{+4}+6e\\O^0+2e\rightarrow O^{-2}\end{matrix}|\begin{matrix}\times1\\\times3\end{matrix}\)

c) \(CH_4+2O_2\rightarrow CO_2+2H_2O\)

\(\begin{matrix}C^{-4}\rightarrow C^{+4}+8e\\O^0+2e\rightarrow O^{-2}\end{matrix}|\begin{matrix}\times1\\\times4\end{matrix}\)

d) \(2H_2S+3O_2\rightarrow2H_2O+2SO_2\)

\(\begin{matrix}S^{-2}\rightarrow S^{+4}+6e\\O^0+2e\rightarrow O^{-2}\end{matrix}|\begin{matrix}\times1\\\times3\end{matrix}\)

e) \(4NH_3+3O_2\rightarrow2N_2+6H_2O\)

\(\begin{matrix}N^{-3}\rightarrow N^0+3e\\O^0+2e\rightarrow O^{-2}\end{matrix}|\begin{matrix}\times2\\\times3\end{matrix}\)

a)N2+O2->2NO

b)C2H5OH+3O2->2CO2+3H2O

c)CH4+2O2->CO2+2H2O

d)H2S+3/2O2->H2O+SO2 / 2H2S+3O2->2H2O+2SO2

e)2NH3+3/2O2->N2+3H2O / 4NH3+3O2->2N2+6H2O

CHÚC BN HỌC TỐT :))))

$C_x{H}_y{O}_z$+$\left(x+\frac{y}{4}-\frac{z}{2}\right)O_2$---->$xC{O}_2+\frac{y}{2}{H}_{2}O$

3)

2Al + 6H2SO4 → Al2(SO4)3 + 3SO2 + 6H2O

Cân bằng CxHyOz + O2 ------> CO2 + H2O - Thuy Kim

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

\(1) 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\\ 2) Na_2O + H_2SO_4 \to Na_2SO_4 + H_2O\\ 3) ZnO + H_2SO_4 \to ZnSO_4 + H_2O\\ 4) NaOH + HCl \to NaCl + H_2O\\ 5) 2NaOH + CO_2 \to Na_2CO_3 + H_2O\\ 6) Mg + 2HCl \to MgCl_2 + H)2\\ 7) Cu + 2AgNO_3 \to Cu(NO_3)_2 + 2Ag\\ 8) 2K + S \xrightarrow{t^o} K_2S\)

1, $2Fe(OH)_3\xrightarrow{t^o} Fe_2O_3+3H_2O$

2, $H_2SO_4+2NaOH\to Na_2SO_4+2H_2O$

3, $H_2SO_4+Zn(OH)_2\to ZnSO_4+2H_2O$

4, $NaOH+HCl\to NaCl+H_2O$

5, $2NaOH+CO_2\to Na_2CO_3+H_2O$

6, $Mg+2HCl\to MgCl_2+H_2$

7, $Cu+2AgNO_3\to Cu(NO_3)_2+2Ag$

8, $2K+S\xrightarrow{t^o} K_2S$

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) \(2K+2H_2O->2KOH+H_2\)

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

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

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

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

\(P_2O_5+3H_2O\rightarrow2H_3PO_4\)

\(2Fe\left(OH\right)_3\rightarrow Fe_2O_3+3H_2O\)

PT còn lại đều cân bằng rồi bạn à