Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
12 2Na+2H2O----2NaOH+H2
13 Fe+2HCl-----FeCl2+H2
14.2Na+2H2O-----2NaOH+H2
15.Zn+2HCl------ZnCl2+H2
16 2CxHy+(4x+y)O2------2xCO2+yH2O
17 P2O5+3H2O-------2H3PO4
18 Fe2(SO4)3+6KOH--------2Fe(OH)3+3K2SO4
19 2Fe+3Cl2-------2FeCl3
20 CnH2n – 2 + \(\dfrac{3n-1}{2}\)O2 -> nCO2 +(n-1) H2O.
21 N2O5+H2O------2HNO3
22 FeCL3+3NaOH-------Fe(OH)3+3NaCL
\(4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\\ Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3\downarrow+H_2O\\ 2K+2H_2O\rightarrow2KOH+H_2\uparrow\\ Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\\ Fe+S\rightarrow\left(t^o\right)FeS\\ 2Al\left(OH\right)_3\rightarrow\left(t^o\right)Al_2O_3+3H_2O\\ 2HgO\rightarrow\left(450^oC-500^oC\right)2Hg+O_2\uparrow\\ CuCl_2+2KOH\rightarrow Cu\left(OH\right)_2\downarrow+2KCl\\ Cu\left(OH\right)_2\rightarrow\left(t^o\right)CuO+H_2O\)
1. `4P + 5O_2 -> 2P_2O_5`
2.`Ca(OH)_2 + CO_2 -> CaCO_3 \downarrow + H_2O`
3. `2K +2 H_2O -> 2KOH + H_2 \uparrow`
4. `Fe + 2HCl -> FeCl_2 + H_2 \uparrow`
5. `2Al + 3H_2SO_4 -> Al_2(SO_4)_3 + 3H_2 \uparrow`
6. `Fe + S -> FeS`
7. `2Al(OH)_3 -> Al_2O_3 + 3H_2O`
8. `2HgO -> 2Hg + O_2 \uparrow`
9. `CuCl_2 + 2KOH -> Cu(OH)_2\downarrow + 2KCl`
10. `Cu(OH)_2 ->CuO + H_2O`
a) 2Al + 3Cl2 ---> 2AlCl3
b) Fe2O3 + 3H2 ---> 2Fe + 3H2O
c) 4P + 5O2 ---. 2P2O5
d) 2Al(OH)3 ---> Al2O3 + 3H2O
e) (NH4)2CO3 + 2NaOH ---> 2Na2CO3 + NH3 + 2H2O
f) Fe + HCl ---> FeCl2 + O2 (đề sai)
g) 2KClO3 ----> 2KCl + 3O2
h) 3NaOH + FeCl3 ----> Fe(OH)3 + 3NaCl
i) ZnO + 2HCl ----> ZnCl2 + H2O
k) 2K + 2H2O ----> 2KOH + H2
m) 2Na + 2H2O ----> 2NaOH + H2
n) BaCl2 + H2SO4 -----> BaSO4 + 2HCl
o) Na2O + H2O ---> 2NaOH
a) 2Al + 3Cl2 → 2AlCl3
b) 2Fe2O3 + 6H2 → 4Fe + 6H2O
c)4P +5O2 → 2P2O5
d) 2Al(OH)3 → Al2O3 + 3H2O
e) \(\left(NH_4\right)_2CO_3+2NaOH\rightarrow Na_2CO_3+2NH_3+2H_2O\)
f) Fe + 2HCl → FeCl2 + H2
g) 2KClO3 → 2KCl + 3O2
h) 3NaOH + FeCl3 → Fe(OH)3 + 3NaCl
i) ZnO + 2HCl → ZnCl2 + H2O
k) 2K + 2H2O → 2KOH + H2
m) 2Na + 2H2O → 2NaOH + H2
n) BaCl2 + H2SO4 → BaSO4 + 2HCl
o) Na2O + H2O → 2NaOH
1) C4H10 + \(\dfrac{13}{2}\)O2 \(\underrightarrow{to}\) 4CO2 + 5H2O
2) 6NaOH + Fe2(SO4)3 → 3Na2SO4 + 2Fe(OH)3↓
3) 4FeS2 + 11O2 \(\underrightarrow{to}\) 2Fe2O3 + 8SO2
4) 6KOH + Al2(SO4)3 → 3K2SO4 + 2Al(OH)3↓
5) 2CH4 + O2 + 2H2O → 2CO2 + 6H2
6) 8Al + 3Fe3O4 → 4Al2O3 + 9Fe
Bài 1 Cân bằng các PTHH sau:
1) FeCl2+2NaOH -> Fe(OH)2+2NaCl
2) MnO2 +4HBr -> Br2+MnBr2+2H2O
3) Cl2+SO2+2H2O->2HCl+ H2SO4
4)Ca(OH)2+ 2NH4NO3-> 2NH3+Ca(NO3)2+2H2O
5) Ca(H2PO4)2 + 2Ca(OH)2-> Ca3(PO4)2+4H2O
6)4CxHy(COOOH)2+(2x+y+2)O2->(4x+8)CO2+(2y+4)H2O
7)KHCO3+Ca(OH)2->K2SO4+H2O
-->câu này sai đề nhé
8)Al2O3+ 6KHSO4->Al2(SO4)3+3K2SO4+3H2O
9)xFe2O3+(3x-2y)H2-> 2FexOy+(3x-2y)H2O
10)2NaHSO4+BaCO3->Na2SO4+BaSO4+CO2+H2O
11)6H2SO4+2Fe->Fe2(SO4)3+3SO2+6H2O
12)Ba(HCO3)2+Ca(OH)2->BaCO3+CaCO3+2H2O
13)4FexOy+yO2->2xFe2O3
Bài 2
2Al+6HCl--->2AlCl3+3H2
a) n Al=8,1/27=0,3(mol)
n HCl=21,9/36,5=0,6(mol)
Lập tỉ lệ
n Al=0,3/2=0,15
n HCl=0,6/6=0,1(mol)
--->Al dư
n Al=1/3n HCl=0,2(mol)
n Al dư=0,3-0,2=0,1(mol)
m Al dư=0,1.27=2,7(g)
b) Theo pthh
n AlCl3=1/3n HCl=0,2(mol)
m AlCl3=133,5.0,2=26,7(g)
c) n H2=1/2n HCl=0,3(mol)
H2+CuO--->Cu+H2O
Theo pthh
n CuO=n H2=0,3(mol)
m CuO=0,3.80=24(g)
Chúc bạn học tốt
1) 4Al + 3O2 --to--> 2Al2O3
2) 2NaOH + H2SO4 --> Na2SO4 + 2H2O
3) 2Al + 6HCl --> 2AlCl3 + 3H2
4) Fe2O3 + 3H2SO4 --> Fe2(SO4)3 + 3H2O
5) P2O5 + 3H2O --> 2H3PO4
6) 3Ca(OH)2 + 2FeCl3 --> 3CaCl2 + 2Fe(OH)3
1) 2Mg + O2 -to-➢ 2MgO
2) 2K + 2H2O → 2KOH + H2
3) 2NaOH + CuCl2 → 2NaCl + Cu(OH)2
4) 2Fe + 3Cl2 -to-➢ 2FeCl3
5) 6KOH + Al2(SO4)3 → 3K2SO4 + 2Al(OH)3
6) 3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
a) 2Mg + O2 → 2MgO
b) 2K + 2H2O → 2KOH + H2
c) 2NaOH + CuCl2 → 2NaCl + Cu(OH)2↓
d) 2Fe + 3Cl2 → 2FeCl3
e) 6KOH + Al2(SO4)3 → 3K2SO4 + 2Al(OH)3↓
f) 3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O