Bài 3 :

4FeS + 7O2 --t--> 2Fe2O3 + 4SO2

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

Fe(NO3)3 + 3 NaOH -> Fe(OH)3 +3NaNO3

2Fe(OH)3 --t--> Fe2O3 + 3H2O

Fe2O3 + 3H2 -t-> 2Fe + 3H2O

Fe + S -t-> FeS

1, FeCl₃ + 3KOH → Fe(OH)₃ + 3KCl

2Fe(OH)₃ \(\underrightarrow{t^o}\)Fe₂O₃ + 3H₂O

Fe₂O₃ + 3H₂ \(\underrightarrow{t^o}\) 2Fe + 3H₂O

3Fe + 2O₂ \(\underrightarrow{t^o}\) Fe₃O₄

2, 2Ca + O₂ \(\underrightarrow{t^o}\) 2CaO

CaO + H₂O → Ca(OH)₂

Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

CaCO₃ + H₂O + CO₂→ Ca(HCO₃)₂

Ca(HCO₃)₂ + 2HCl → CaCl₂ + 2H₂O + 2CO₂

CaCl₂ + Ca(OH)₂ → 2CaO + 2HCl

3, 4FeS + 7O₂ \(\underrightarrow{t^o}\) 2Fe₂O₃ + 4SO₂

Fe₂O₃ + 6HNO₃ → 2Fe(NO₃)₃ + 3H₂O

Fe(NO₃)₃ + 3KOH → Fe(OH)₃ + 3KNO₃

2Fe(OH)₃ \(\underrightarrow{t^o}\) Fe₂O₃ + 3H₂O

Fe₂O₃ + 3H₂ \(\underrightarrow{t^o}\) 2Fe + 3H₂O

Fe + S \(\underrightarrow{t^o}\) FeS

\(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\\2 Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\\ Fe_2O_3+3CO\rightarrow2Fe+3CO_2\\3 Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

\(Ca+\frac{1}{2}O_2\underrightarrow{t^o}CaO\\ CaO+H_2O\rightarrow Ca\left(OH\right)_2\\ Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\\ CaCO_3+H_2O+CO_2\rightarrow Ca\left(HCO_3\right)_2\\ Ca\left(HCO_3\right)+2HCl\rightarrow CaCl_2+2H_2O+2CO_2\\ CaCl_2+Ca\left(OH\right)_2\rightarrow2CaO+2HCl\)

\(4FeS+7O_2\underrightarrow{t^o}2Fe_2O_3+4SO_2\\ Fe_2O_3+HNO_3\rightarrow Fe\left(NO_3\right)_3+H_2O\\ Fe\left(NO_3\right)_3+3NaOH\rightarrow3NaNO_3+Fe\left(OH\right)_3\\ 2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\\ Fe_2O_3+3CO\underrightarrow{t^o}2Fe+3CO_2\\ Fe+S\underrightarrow{t^o}FeS\)

a) SO₂ + Na₂O -> Na₂SO₃

Na₂SO₃ + H₂SO₄ -> Na₂SO₄ + SO₂ + H₂O

Na₂SO₄ + Ba(OH)₂ -> BaSO₄ \(\downarrow\)+ 2NaOH

2NaOH + CO₂ -> Na₂CO₃ + H₂O

b) CaO + CO₂ -> CaCO₃

CaCO₃ \(\rightarrow^{t^o}\) CaO + CO₂

CaO + H₂O -> Ca ( OH)₂

Ca ( OH)₂ + CO₂ -> CaCO₃ + H₂O

CaCO₃ + H₂SO₄ -> CaSO₄ + CO₂ + H₂O

c) 2Fe + 3Cl₂ \(\rightarrow^{t^o}\) 2FeCl₃

FeCl₃ + 3NaOH -> Fe(OH)₃ \(\downarrow\) + 3NaCl

2Fe(OH)₃ \(\rightarrow^{t^o}\) Fe₂O₃ + 3H₂O

Fe₂O₃ + 3H₂SO₄ -> Fe₂(SO₄)₃ + 3H₂O

Fe₂(SO₄)₃ + 3BaCl₂ -> 2FeCl₃ + 3BaSO₄\(\downarrow\)

d) Fe + 2HCl -> FeCl₂ + H₂

FeCl₂ + 2AgNO₃ -> 2AgCl\(\downarrow\) + Fe(NO₃)₂

Fe(NO₃)₂ + 2NaOH -> Fe(OH)₂\(\downarrow\) + 2NaNO₃

Fe(OH)₂ + H₂SO₄ -> FeSO₄ + 2H₂O

a, SO₂ + 2NaOH \(\rightarrow\)Na₂SO₃ + H₂O

Na₂SO₃ + H₂SO₄ \(\rightarrow\)Na₂SO₄ + H₂O + SO₂

Na₂SO₄ + Ba(OH)₂\(\rightarrow\) BaSO₄+ 2 NaOH

CO₂ + 2 NaOH \(\rightarrow\)Na₂CO₃ + H₂O

b, CaO + CO₂\(\rightarrow\) CaCO₃

CaCO₃ -t⁰-> CaO + CO₂

CaO + H₂O \(\rightarrow\)Ca(OH)₂

Ca(OH)₂ + CO₂ \(\rightarrow\)CaCO₃ + H₂O

CaCO₃ + H₂SO₄ \(\rightarrow\)CaSO₄ + H₂O + CO₂

c, 2Fe + 3Cl₂ -t⁰-> 2FeCl₃

FeCl₃ + 3NaOH \(\rightarrow\)Fe(OH)₃ + 3NaCl

2Fe(OH)₃ -t⁰-> Fe₂O₃ + 3H₂O

Fe₂O₃ + 3H₂SO₄ \(\rightarrow\)Fe₂(SO4)₃ + 3H₂O

Fe₂(SO4)₃ + 3BaCl₂ \(\rightarrow\)2FeCl₃ + 3BaSO₄

d, Fe + 2HCl \(\rightarrow\)FeCl₂ + H₂

FeCl_{2 +} 2AgNO₃ \(\rightarrow\)Fe(NO₃)₂ + 2AgCl

Fe(NO₃)₂ + 2NaOH \(\rightarrow\)Fe(OH)₂ + 2NaNO₃

Fe(OH)₂ + H₂SO₄\(\rightarrow\) FeSO₄ + 2H₂O

e, 2Cu + O₂ -t⁰-> 2CuO

CuO + 2HCl \(\rightarrow\)CuCl₂ + H₂O

CuCl₂ + 2NaOH\(\rightarrow\) Cu(OH)₂ + 2NaCl

Cu(OH)₂ -t⁰-> CuO + H₂O

CuO + H₂ -t⁰-> Cu + H₂O

Cu + 2H₂SO_4đặc \(\rightarrow\)CuSO₄ + SO₂ + 2H₂O

f, 2Al₂O₃ -đpnc/ criolit-> 4Al + 3O₂

2Al + 3Cl₂ -t⁰-> 2AlCl₃

AlCl₃ + 3NaOH \(\rightarrow\)Al(OH)₃ + 3NaCl

2NaCl + 2H₂O -đpmn-> 2NaOH + Cl₂ + H₂

2NaOH + CuCl₂ \(\rightarrow\)Cu(OH)₂ + 2NaCl

\(a,\\ \left(1\right)Fe+Cu\left(NO_3\right)_2\rightarrow Fe\left(NO_3\right)_2+Cu\\ \left(2\right)Fe\left(NO_3\right)_2+2KOH\rightarrow Fe\left(OH\right)_2\downarrow+2KNO_3\\ \left(3\right)Fe\left(OH\right)_2+2HCl\rightarrow FeCl_2+2H_2O\)

\(\left(4\right)FeCl_2\) \(\rightarrow\left(đpdd\right)\)  \(Fe+Cl_2\)

\(b,\\ \left(1\right)2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ \left(2\right)FeCl_3+3AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\downarrow\\ \left(3\right)Fe\left(NO_3\right)_3+3KOH\rightarrow Fe\left(OH\right)_3+3KNO_3\\ \left(4\right)2Fe\left(OH\right)_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\)

a. + 3 ---> Al2(SO4)3 + 3H2O

b. 2 + 3 --->2Fe(OH)3 + 3Ba(NO3)2

c. 3 + 2 ---> Ca₃(PO₄)₂ + 6KNO₃

d. + 2 ---> CaCl₂ + 2CO₂ + 2H₂O

a, Al2O3+3H2SO4--->Al2(SO4)3+3H2O

b, 2Fe(NO3)3+3Ba(OH)2--->2Fe(OH)3+3Ba(NO3)2

c, 3Ca(NO3)2+2K3PO4--->Ca3(PO4)2+6KNO3

d, Ca(HCO3)2+2HCl--->CaCl2+2CO2+2H2O

M : Mg(HCO₃)₂ : magiê hidrocabonat

Fe₂(SO₄)₃: sắt III sunfat

OB: Fe₂O₃ : sắt III oxit

BZ: Ca(OH)₂: canxi hidroxit

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

\(C+O_2\underrightarrow{t^o}CO_2\)

\(CO_2+CaO\rightarrow CaCO_3\)

\(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)

\(CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl_{\downarrow}\)

Bạn tham khảo nhé!

\(C+O_2\underrightarrow{t^0}CO_2\)

\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)

\(CaCO_3+2HCl\rightarrow H_2O+CO_2+CaCl_2\)

\(CaCl_2+2AgNO_3\rightarrow2AgCl+Ca\left(NO_3\right)_2\)