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![](https://rs.olm.vn/images/avt/0.png?1311)
1, 4Cu+5H2SO4(đặc)→4CuSO4+H2S+4H2O
2, 2Fe+6H2SO4(đặc)→Fe2(SO4)3+3SO2+6H2O
3, 8Fe+15H2SO4(đặc)→4Fe2(SO4)3+3H2S+12H2O
4, Fe+6HNO3(đặc)→Fe(NO3)3+3NO2+3H2O
5, 8Fe+30HNO3(đặc)→8Fe(NO3)3+3N2O+15H2O
6, 10Fe+36HNO3(đặc)→10Fe(NO3)3+3N2+18H2O
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2C_xH_yO_z+\dfrac{4x+y-2z}{2}O_2\underrightarrow{t^o}2xCO_2+yH_2O\)
\(2C_xH_yO+\dfrac{4x+y-2}{2}O_2\underrightarrow{t^o}2xCO_2+yH_2O\)
\(6Fe_xO_y+\left(12x-2y\right)H_2SO_{4\left(đ\right)}\underrightarrow{t^o}3xFe_2\left(SO_4\right)_3+\left(3x-2y\right)S+\left(12x-2y\right)H_2O\)
\(8Fe_xO_y+\left(30x-4y\right)HNO_3\rightarrow8xFe\left(NO_3\right)_3+\left(3x-2y\right)N_2O+\left(15x-2y\right)H_2O\)
2 PTHH đầu mình cân bằng như bth, 2 PTHH cuối mình dùng phương pháp electron
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 2Fe+6H2SO4\(\rightarrow\)Fe2(SO4)3+3SO2+6H2O
b, 3Cu+8HNO3\(\rightarrow\) 3Cu(NO3)2+2NO+4H2O
c, Fe+4HNO3\(\rightarrow\) Fe(NO3)3+NO+2H2O
d, Al+6HNO3\(\rightarrow\)Al(NO3)3+3NO2+3H2O
e, Cu+4HNO3\(\rightarrow\) Cu(NO3)2+2NO2+2H2O
Chúc bạn học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
$\rm u)S + 2HNO_3 \rightarrow H_2SO_4 + 2NO \uparrow$
$\rm v)3Ba(NO_3)_2 + Al_2(SO_4)_3 \rightarrow 3BaSO_4 \downarrow + 2Al(NO_3)_3$
$\rm w)3Ba(OH)_2 + P_2O_5 \rightarrow Ba_3(PO_4)_3 \downarrow + 3H_2O$
$\rm x)2Fe_2O_3 + 3C \xrightarrow{t^o} 4Fe + 3CO_2 \uparrow$
![](https://rs.olm.vn/images/avt/0.png?1311)
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) \(2K+2H_2O->2KOH+H_2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
$\rm k)2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2 \uparrow$
$\rm l)CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O$
$\rm m)2Al + 3H_2SO_4 \rightarrow Al_2(SO_4)_3 + 3H_2 \uparrow$
$\rm n)Na_2CO_3 + CaCl_2 \rightarrow CaCO_3 \downarrow + 2NaCl$
$\rm o)2Na + 2H_2O \rightarrow 2NaOH + H_2 \uparrow$
$\rm p)CaO + 2HNO_3 \rightarrow Ca(NO_3)_2 + H_2O$
$\rm q)P_2O_5 + 3H_2O \rightarrow 2H_3PO_4$
$\rm r)Zn + 2HCl \rightarrow ZnCl_2 + H_2 \uparrow$
$\rm s)4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3$
$\rm t)Ba(OH)_2 + 2HCl \rightarrow BaCl_2 + 2H_2O$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2KHCO_3+Ca\left(OH\right)_2\rightarrow K_2CO_2+CaCO_3+2H_2O\)
\(Al_2O_3+6KHSO_4\rightarrow Al_2\left(SO_4\right)_3+3K_2SO_4+3H_2O\)
\(nFe_2O_3+\left(3y-2x\right)H_2\rightarrow2Fe_xO_y+\left(3y-2x\right)H_2O\)
\(2NaHSO_4+BaCO_3\rightarrow Na_2SO_4+BaSO_4+CO_2+H_2O\)
\(6H_2SO_4+2Fe\rightarrow Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`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`
Cân bằng CxHyOz + O2 ------> CO2 + H2O - Thuy Kim
CxHyOzCxHyOz+(x+y4−z2)O2(x+y4−z2)O2---->xCO2+y2H2O
3) Cu+2H2SO4→CuSO4+SO2+2H2O
2Al + 6H2SO4 → Al2(SO4)3 + 3SO2 + 6H2O