`Fe + 2HCl -> FeCl_2 + H_2`

`2Na + 2HCl -> 2NaCl + H_2`

`2Al + 6HCl -> 2AlCl_3 + 3H_2`

`2Al(OH)_3 + 3H_2SO_4 -> Al_2(SO_4)_3 + 6H_2O`

Fe + 2HCl → FeCl₂ + H₂
2Na + 2HCl → 2NaCl + H₂
2Al + 6HCl → 2AlCl₃ + 3H₂
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(2Na+2HCl\rightarrow2NaCl+H_2\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

\(2Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\)

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1+1=3

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2Al + 6H₂SO₄ → Al₂(SO₄)₃ + 6H₂O

(5x-2y) Al + (18x-6y) HNO₃ → (5x-2y) Al(NO₃)₂ + 3N_xO_y + (9x-3y) H₂O

2M + 2n H₂SO₄ → M₂(SO₄)_n + nSO₂ +2n H₂O

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) \(2K+2H_2O->2KOH+H_2\)

$\rm u)S + 2HNO_3 \rightarrow H_2SO_4 + 2NO \uparrow$

$\rm v)3Ba(NO_3)_2 + Al_2(SO_4)_3 \rightarrow 3BaSO_4 \downarrow + 2Al(NO_3)_3$
$\rm w)3Ba(OH)_2 + P_2O_5 \rightarrow Ba_3(PO_4)_3 \downarrow + 3H_2O$
$\rm x)2Fe_2O_3 + 3C \xrightarrow{t^o} 4Fe + 3CO_2 \uparrow$

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

3)

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

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

a) 2Al+ 3H2SO4-> Al2(SO4)3+3H2

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

a) 2 \(\rightarrow\)

b) 2 \(\rightarrow\)

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

CaCO₃ \(\underrightarrow{to}\) CaO + CO₂

2Al(OH)₃ \(\underrightarrow{to}\) Al₂O₃ + 3H₂O

3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O

4P + 5O₂ \(\underrightarrow{to}\) 2P₂O₅

2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O

2AlCl₃ + 3Ba(OH)₂ → 3BaCl₂ + 2Al(OH)₃

2Na₃PO₄ + 3CaCl₂ → 6NaCl + Ca₃(PO₄)₂

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Cân bằng các phương trình hoa học sau:
$\mathrm{2A}l+\; 6\mathrm{H2}S{O}_4->A{l}_2{\left(S{O}_4\right)}_3+\; 3S{O}_2+\; 6H_{2}O$

$CaC{O}_3->Ca{O}_2+C{O}_2$

$\mathrm{2A}\mathrm{l(}O{\mathrm{H)}}_3->A{l}_2{O}_3+\; 3H_{2}O$

$\mathrm{3C}u+\; 8HN{O}_3->\; 3Cu{\left(N{O}_3\right)}_2+\; 2NO+\; 4H_{2}O$

$\mathrm{4P}+\; 5O_2->\; 2P_2{O}_5$

$\mathrm{2A}\mathrm{l(}O{\mathrm{H)}}_3+\; 3H_{2}S{O}_4->A{l}_2{\left(S{O}_4\right)}_3+\; 6H_{2}O$

$\mathrm{2A}lC{l}_3+\; 3BaO{H}_2->\; 3AlO{H}_3+\; 2BaC{l}_2$

$\mathrm{2N}{a}_{3}P{O}_4+\mathrm{C3}aC{l}_2->\; 6NaCl+C{a}_3{\left(P{O}_4\right)}_2$

2Fe+6H₂SO₄\(\rightarrow\)Fe₂(SO₄)₃+3SO₂+6H₂O

2Fe + 6H2SO4 -> Fe2(SO4) + 3SO2 + 6H2O

2Fe+6H2SO4--->Fe2(SO4)3+3SO2+6H2O