Fe2O3+6HCl--->2FeCl3+3H2O

FeCl3+3HNO3---->Fe(NO3)3+3HCl

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

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

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

\(1.\text{Fe2O3 + 6HCl → 3H2O + 2FeCl3}\)

\(2.\text{3AgNO3 + FeCl3 → 3AgCl + Fe(NO3)3}\)

\(3.\text{ 3Ba(OH)2 + 2Fe(NO3)3 → 3Ba(NO3)2 + 2Fe(OH)3 (kt) }\)

\(4.\text{3H2SO4 + 2Fe(OH)3 → Fe2(SO4)3 + 6H2O}\)

\(5.\text{3BaCl2 + Fe2(SO4)3 → 2FeCl3 + 3BaSO4}\)

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

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

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

N ở đâu ra zậy

ko biết đề cô nó cho thế nên ms phải hỏi

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

$\mathrm{1)2C}\mathrm{a+O2}\to 2CaO$

$\mathrm{2)CaO+SO2}\to CaS{O}_3$

\(3Ca+2H2O--->Ca\left(OH\right)2+H2\)

$(4)CaSO3+2HNO3\to S{O}_2$+Ca(NO3)2 +H2O

5) Ca(OH)2 + CO2---->CaCO3 +H2O

$(6)SO2+H2O\to H_{2}S{O}_3$

\(7\) ) CaO + CO2--->CaCO3

8) SO3 +H2O--->H2SO4

\(1\\ 2Al\left(OH\right)_3\rightarrow\left(t^o\right)Al_2O_3+3H_2O\\ 2\\ Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\\ Al_2\left(SO_4\right)_3+3BaCl_2\rightarrow3BaSO_4+2AlCl_3\)

PTHH hàng thứ 3 là PUHH (3)

a)

\(BaCl_2+K_2SO_4\rightarrow BaSO_4+2KCl\\ BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\)

b)

\(Ba\left(NO_3\right)_2+Na_2SO_4\rightarrow BaSO_4+2NaNO_3\\ CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)

a: \(SO_3+2NaOH\rightarrow Na_2SO_4+H_2O\)

\(HNO_3+NaOH\rightarrow NaNO_3+H_2O\)

\(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2\downarrow+2HCl\)

\(\left(NH_4\right)_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O+2NH_3\uparrow\)

b: \(SO_3+Ca\left(OH\right)_2\rightarrow CaSO_4+H_2O\)

\(Ca\left(OH\right)_2+2HNO_3\rightarrow Ca\left(NO_3\right)_2+2H_2O\)

\(Ca\left(OH\right)_2+CuCl_2\rightarrow Cu\left(OH\right)_2\downarrow+CaCl_2\)

\(Ca\left(OH\right)_2+\left(NH_4\right)_2SO_4\rightarrow CaSO_4+2NH_3\uparrow+2H_2O\)

a) \(SO_3+2NaOH\rightarrow Na_2SO_4+H_2O\)

\(HNO_3+NaOH\rightarrow NaNO_3+H_2O\)

\(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl\)

\(\left(NH_4\right)SO_4+2NaOH\xrightarrow[t^o]{}Na_2SO_4+2NH_3+2H_2O\) 

b) \(SO_3+Ca\left(OH\right)_2\rightarrow CaSO_4+H_2O\) 

\(2HNO_3+Ca\left(OH\right)_2\rightarrow Ca\left(NO_3\right)_2+2H_2O\)

\(CuCl_2+Ca\left(OH\right)_2\rightarrow Cu\left(OH\right)_2+CaCl_2\)

\(\left(NH_4\right)SO_4+Ca\left(OH\right)_2\underrightarrow{t^o}CaSO_4+2NH_3+2H_2O\)

2Fe_xO_y + (6x-2y)H₂SO₄ -> xFe₂(SO₄)₃ + (3x-2y)SO₂ + (6x-2y)H₂O