\(2Fe + 3Cl_2 \xrightarrow{t^o} 2FeCl_3\\ FeCl_3 + 3KOH \to Fe(OH)_3 + 3KCl\\ Fe(OH)_3 + 3HNO_3 \to Fe(NO_3)_3 + 3H_2O\\ Fe(NO_3)_3 + 3KOH \to 3KNO_3 + Fe(OH)_3\\ 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\\ Fe_2O_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 3H_2O\)

Fe + 3/2Cl2 -to-> FCl3 

FeCl2 + 3NaOH => Fe(OH)3 + 3NaCl 

Fe(OH)3 + 3 HNO3 => Fe(NO3)3 + 3H2O 

Fe(NO3)3 + 3NaOH => Fe(OH)3 + 3NaNO3 

2Fe(OH)3 -to-> Fe2O3 + 3H2O 

Fe2O3 + 3H2SO4 => Fe2(SO4)3 + 3H2O 

(1) 2 Fe + 3 Cl2 -to-> 2 FeCl3

(2) FeCl3 + 3 NaOH -> Fe(OH)3 + 3 NaCl

(3) Fe(OH)3 + 3 HNO3 -> Fe(NO3)3 + 3 H2O

(4) Fe(NO3)3 + 3 KOH -> Fe(OH)3 + 3 KNO3

(5) 2 Fe(OH)3 -to-> Fe2O3 + 3 H2O

(6)  Fe2O3 + 3 H2SO4 -> Fe2(SO4)3 + 3 H2O

\(2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)

\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)

\(Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow2FeCl_3+3BaSO_4\)

\(FeCl_3+3AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\)

$(1) 2Al_2O_3 \xrightarrow{đpnc} 4Al + 3O_2$
$2Al + 6HCl \to 2AlCl_3 + 3H_2$
$AlCl_3 + 3KOH \to Al(OH)_3 + 3KCl$
$(2) Fe_2O_3 + 3CO \xrightarrow{t^o} 2Fe + 3CO_2$
$2Fe  + 3Cl_2 \xrightarrow{t^o} 2FeCl_3$
$FeCl_3 + 3KOH \to Fe(OH)_3 + 3KCl$
$(3) 2Fe  + 3Cl_2 \xrightarrow{t^o} 2FeCl_3$
$FeCl_3 + 3KOH \to Fe(OH)_3 + 3KCl$
$2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O$
$Fe_2O_3 + 3CO \xrightarrow{t^o} 2Fe + 3CO_2$
$Fe + 6H_2SO_4 \to Fe_2(SO_4)_3 + 3SO_2 + 6H_2O$

\(a,4Al+3O_2\xrightarrow[t^0]{}2Al_2O_3\\ Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\\ AlCl_3+3AgNO_3\rightarrow Al\left(NO_3\right)_3+3AgCl\\ AlCl_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaCl\\ 2Al\left(OH\right)_3\xrightarrow[t^0]{}Al_2O_3+3H_2O\\ 2Al_2O_3\xrightarrow[đpnc]{criolit}4Al+3O_2\\ b,3Fe+2O_2\xrightarrow[t^0]{}Fe_3O_4\\ Fe_3O_4+8HCl\rightarrow2FeCl_3+FeCl_2+4H_2O\\ FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\\ 2Fe\left(OH\right)_3\xrightarrow[t^0]{}Fe_2O_3+3H_2O\\ Fe_2O_3+3CO\xrightarrow[t^0]{}2Fe+3CO_2\)

\(c,2Fe\left(OH\right)_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\\ Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow2FeCl_3+3BaSO_4\\ FeCl_3+AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\)

(1) 2Fe(OH)₃ \(^{to}\rightarrow\) Fe₂O₃ + 3H₂O

(2) Fe₂O₃ + 6HCl -> 2FeCl₃ + 3H₂O

(3) FeCl₃ + 3AgNO₃ -> 3AgCl \(\downarrow\) + Fe(NO₃)₃

(4) Fe(NO₃)₃ + 3NaOH -> 3NaNO₃ + Fe(OH)₃ \(\downarrow\)

(5)2 Fe(OH)₃ + 3H₂SO₄ -> Fe₂(SO₄)₃ + 6H₂O

pthh:

(1) 2Fe(OH)₃ Fe₂O₃ + 3H₂O

(2) Fe₂O₃ + 6HCl \(\rightarrow\) 2FeCl₃ + 3H₂O

(3) FeCl₃ + 3AgNO₃ \(\rightarrow\) 3AgCl + Fe(NO₃)₃

(4) Fe(NO₃)₃ + 3KOH \(\rightarrow\) 3KNO₃ + Fe(OH)₃

(5) 2Fe(OH)₃ + 3CuSO₄ \(\rightarrow\) Fe₂(SO₄)₃ + 3Cu(OH)₂

2Fe(OH)₃\(\xrightarrow[]{to}\) Fe₂O₃+ 3H₂O

Fe₂O₃+ 6HCl\(\rightarrow\) 2FeCl₃+ 3H₂O

FeCl₃+ 3AgNO₃\(\rightarrow\) Fe(NO₃)₃+ 3AgCl\(\downarrow\)

Fe(NO₃)₃+ 2NaOH\(\rightarrow\) Fe(OH)₃\(\downarrow\)+ 3NaNO₃

2Fe(OH)₃+ 3H₂SO₄\(\rightarrow\) Fe₂(SO₄)₃+ 6H₂O

\(2Fe\left(OH\right)_3-^{t^o}\rightarrow Fe_2O_3+3H_2O\\ Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow2FeCl_3+3BaSO_4\\ FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)