âu1: (2điểm ) Lập PTHH của các phản ứng sau a. Mg + HCl MgCl2 + H2 b. Fe + Cl2 FeCl3 c. NaOH + H2SO4 Na2SO4 + H2O d. FexOy + O2 Fe2O3
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a) $4P + 5O_2 \xrightarrow{t^o} 2P_2O_5$
b) $Mg + Cl_2 \xrightarrow{t^o} MgCl_2$
c) $2Na + 2H_2O \to 2NaOH + H_2$
d) $C + O_2 \xrightarrow{t^o} CO_2$
e) $C_xH_y + (x + \dfrac{y}{4})O_2 \xrightarrow{t^o} xCO_2 + \dfrac{y}{2}H_2O$
f) $2Al + Fe_2O_3 \xrightarrow{t^o} Al_2O_3 + 2Fe$
g) $2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
i) $Fe_xO_y + yCO \xrightarrow{t^o} xFe + yCO_2$
k) $Fe_2O_3 + 6HCl \to 2FeCl_3 +3 H_2O$
l) $3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,Mg+2HCl\rightarrow MgCl_2+H_2\\ 1:2:1:1\\ b,Fe_2O_3+3CO\rightarrow^{t^o}2Fe+3CO_2\uparrow\\ 1:3:2:3\\ c,2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 2:3:1:3\\ d,2Al+3Cl_2\rightarrow^{t^o}2AlCl_3\\ 2:3:2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) $2Fe + 3Cl_2 \xrightarrow{t^o} 2FeCl_3$
b) $2Al + 6HCl \to 2AlCl_3 + 3H_2$
c) $Mg + H_2SO_4 \to MgSO_4 + H_2$
d) $2NaOH + CO_2 \to Na_2CO_3 + H_2O$
e) $Fe_2O_3 +6HCl \to 2FeCl_3 + 3H_2O$
f) $N_2 + 3H_2 \buildrel{{t^o,xt,p}}\over\rightleftharpoons 2NH_3$
f) $2H_2 + O_2 \xrightarrow{t^o} 2H_2O$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Ba\left(OH\right)_2+Na_2SO_4\rightarrow BaSO_4+2NaOH\)
\(C_2H_4+\dfrac{5}{2}O_2\underrightarrow{^{^{t^0}}}2CO_2+2H_2O\)
\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{^{^{t^0}}}FeCl_3\)
\(Fe_xO_y+2yHCl\rightarrow xFeCl_{\dfrac{2y}{x}}+yH_2O\)
\(2Fe_xO_y+2yH_2SO_4\rightarrow xFe_2\left(SO_4\right)_{\dfrac{2y}{x}}+2yH_2O\)
Lập các PTHH của các phản ứng theo sơ đồ sau:
a) Ba(OH)2 + Na2SO4 --------> BaSO4 + 2NaOH
b) C2H4 + 3O2 ----to---> 2CO2 + 2H2O
c) 2Fe + 3Cl2 ------to------> 2FeCl3
h) FexOy + 2y HCl → x FeCl2y/x + y H2O
i) 2FexOy + 2y H2SO4 → x Fe2(SO4)2y/x + 2yH2O
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(4Fe+3O_{2\left(dư\right)}\xrightarrow[]{t^ocao}2Fe_2O_3\)
Tỉ lệ 4 : 3 : 2
b) \(K+H_2O\rightarrow KOH+\dfrac{1}{2}H_2\uparrow\)
Tỉ lệ 1 : 1 : 1 : \(\dfrac{1}{2}\)
c) \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
Tỉ lệ 1 : 2 : 1 : 2
d) \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Tỉ lệ 1 : 1 : 1 : 1
e) \(Zn+Cl_2\xrightarrow[]{t^o}ZnCl_2\)
Tỉ lệ 1 : 1 : 1
g) \(2Fe\left(OH\right)_3\xrightarrow[]{t^o}Fe_2O_3+3H_2O\)
Tỉ lệ 2 : 1 : 3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,4Na+O_2\xrightarrow{t^o}2Na_2O\\ b,Mg+2HCl\to MgCl_2+H_2\\ c,6NaOH+Fe_2(SO_4)_3\to 3Na_2SO_4+2Fe(OH)_3\downarrow\)
\(a.4Na+O_2-^{t^o}\rightarrow2Na_2O\\ b.Mg+2HCl\rightarrow MgCl_2+H_2\\ c.6NaOH+Fe_2\left(SO_4\right)_3\rightarrow3Na_2SO_4+2Fe\left(OH\right)_3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bạn tự chỉ ra tỉ lệ số nguyên tử, phân tử các chất trong pư nhé!
1. \(4Na+O_2\underrightarrow{t^o}2Na_2O\)
2. \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
3. \(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)
4. \(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
5. \(2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)
6. \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
7. \(Mg+2HCl\rightarrow MgCl_2+H_2\)
8. \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
9. \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
10. \(C_2H_6+\dfrac{7}{2}O_2\underrightarrow{t^o}2CO_2+3H_2O\)
11. \(BaCl_2+2AgNO_3\rightarrow Ba\left(NO_3\right)_2+2AgCl_{\downarrow}\)
12. \(Al_2\left(SO_4\right)_3+3Ba\left(OH\right)_2\rightarrow2Al\left(OH\right)_{3\downarrow}+3BaSO_{4\downarrow}\)
13. \(Cu+2H_2SO_{4\left(đ\right)}\underrightarrow{t^o}CuSO_4+SO_2+2H_2O\)
14. \(8Al+3Fe_3O_4\underrightarrow{t^o}4Al_2O_3+9Fe\)
15. \(Fe_2O_3+3CO\underrightarrow{t^o}2Fe+3CO_2\)
16. \(Fe_3O_4+4CO\underrightarrow{t^o}3Fe+4CO_2\)
17. (giống PT 10)
18. \(C_4H_8+6O_2\underrightarrow{t^o}4CO_2+4H_2O\)
19. \(C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^o}2CO_2+H_2O\)
20. \(MnO_2+4HCl_{\left(đ\right)}\underrightarrow{t^o}MnCl_2+Cl_2+2H_2O\)
Bạn tham khảo nhé!
\((1)4Na+O_2\xrightarrow{t^o}2Na_2O\\ (2)4Al+3O_2\xrightarrow{t^o}2Al_2O_3\\ (3)2Fe+3Cl_2\xrightarrow{t^o}2FeCl_3\\ (4)P_2O_5+3H_2O\to 2H_3PO_4\\ (5)2Fe(OH)_3\xrightarrow{t^o}Fe_2O_3+3H_2O\\ (6)2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\\ (7)Mg+2HCl\to MgCl_2+H_2\\ (8)Fe_2O_3+6HCl\to 2FeCl_3+3H_2O\\ (9)2Al+6HCl\to 2AlCl_3+3H_2\\ (10)2C_2H_6+7O_2\to 6H_2O+4CO_2\\ (11)BaCl_2+AgNO_3\to Ba(NO_3)_2+AgCl\downarrow\)
\((12)Al_2(SO_4)_3+3Ba(OH)_2\to 3BaSO_4\downarrow+2Al_2(SO_4)_3\\ (13)Cu+2H_2SO_{4(đ)}\xrightarrow{t^o}CuSO_4+2H_2O+SO_2\uparrow\\ (14)8Al+3Fe_3O_4\to 4Al_2O_3+9Fe\\ (15)Fe_2O_3+2CO\xrightarrow{t^o}2Fe+3CO_2\\ (16)Fe_3O_4+4CO\xrightarrow{t^o}3Fe+4CO_2\\ (17)2C_2H_6+7O_2\to 4CO_2+6H_2O\\ (18)C_4H_8+6O_2\xrightarrow{t^o}4CO_2+4H_2O\\ (20)MnO_2+4HCl\xrightarrow{t^o}MnCl_2+Cl_2+2H_2O\)
\(a,Mg+2HCl\to MgCl_2+H_2\\ b,2Fe+3Cl_2\xrightarrow{t^o}2FeCl_3\\ c,2NaOH+H_2SO_4\to Na_2SO_4+2H_2O\\ d,2Fe_xO_y+\dfrac{3x-2y}{2}O_2\xrightarrow{t^o}xFe_2O_3\)