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a) \(4K+O_2\underrightarrow{t^o}2K_2O\)
Tỉ lệ: 4:1:2
b) \(4Na+O_2\underrightarrow{t^o}2Na_2O\)
Tỉ lệ: 4:1:2
c) \(2Al+3Cl_2\underrightarrow{t^o}2AlCl_3\)
Tỉ lệ: 2:3:2
d) \(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)
Tỉ lệ: 2:3:2
e) \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
Tỉ lệ: 1:3:1:3
f) \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
Tỉ lệ: 1:3:1:3
g) \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Tỉ lệ: 2:2:3
h) \(2KNO_3\underrightarrow{t^o}2KNO_2+O_2\)
Tỉ lệ: 2:2:1
a) 4K + O2 -> 2K2O Tỉ lệ 4:1:2
b) 2Al + 3Cl2 -> 2AlCl3 Tỉ lệ 2:3:2
c) Al2O3 + 3H2SO4 -> Al2(SO4)3 + 3H2O Tỉ lệ 1:3:1:3
1. \(Mg+2HCl\rightarrow MgCl_2+H_2\)
2. \(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
3. \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
4. \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
5. \(Cu+2AgNO_{3\rightarrow}Cu\left(NO_3\right)_2+2Ag\)
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\)
\(n_{Cl_2}=\dfrac{11.2}{22.4}=0.5\left(mol\right)\)
\(2Al+3Cl_2\underrightarrow{^{^{t^0}}}2AlCl_3\)
Lập tỉ lệ :
\(\dfrac{0.2}{2}< \dfrac{0.5}{3}\Rightarrow Cl_2dư\)
\(n_{Al}=n_{AlCl_3}=0.2\left(mol\right)\)
\(m=0.2\cdot133.5=26.7\left(g\right)\)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{Cl_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\\ PTHH:2Al+3Cl_2\underrightarrow{to}2AlCl_3\\ Vì:\dfrac{0,5}{3}>\dfrac{0,2}{2}\)
=> Al hết, Cl2 dư
=> \(n_{AlCl_3}=n_{Al}=0,2\left(mol\right)\\ m_{AlCl_3}=133,5.0,2=26,7\left(g\right)\)
Cái này cân bằng à:
a) 2Al+ 3CuCl2 -> 2AlCl3 +3Cu
b) 2Na + 2HCl -> 2NaCl + H2
c) N2O5 + H2O-> 2HNO3
d) 2Al(OH)3 -t0-> Al2O3 +3H2O
e) Fe2O3 +3H2 -t0-> 2Fe +3H2O
PTHH: \(2Al+3Cl_2\xrightarrow[]{t^o}2AlCl_3\)
Ta có: \(\left\{{}\begin{matrix}n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\n_{Cl_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,2}{2}< \dfrac{0,5}{3}\) \(\Rightarrow\) Clo còn dư, Nhôm p/ứ hết
\(\Rightarrow n_{AlCl_3}=0,2\left(mol\right)\) \(\Rightarrow m_{AlCl_3}=0,2\cdot133,5=26,7\left(g\right)\)
PTHH: 2Al + 3Cl2 → 2AlCl3
Ta có: \(n_{Al}\) = 5,4/27 = 0,2 (mol)
\(n_{Cl_2}\) = 11,2/22,4 = 0,5 (mol)
Theo tỉ lệ PTPƯ, ta có: \(\dfrac{0,2}{2}\)< \(\dfrac{0,5}{3}\) => Clo dư, Al phản ứng hết.
Theo PT: nAl = \(n_{AlCl_3}\) = 0,2 (mol)
=> \(m_{AlCl_3}\)= 0,2 . 133,5 = 26,7 (g)
a. 2Cu + O2 → 2CuO
b. 4Al + 3O2 → 2Al2O3
c. 2H2 +O2 → 2H2O
d. 2Na + Cl2 → 2NaCl
e. 2Al + 3Cl2 → 2AlCl3
f. Fe + 2HCl → FeCl2 + H2
g.3NaOH + AlCl3 → 2Al(OH)3 + 3NaCl
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) $3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4$
a/ \(2Al+3CuSO_4\rightarrow Al_2\left(SO_4\right)_3+3Cu\)
b/ \(2Fe+3Cl_2\rightarrow2FeCl_3\)
c/ \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
a. \(2Al+3CuSO_4\rightarrow Al_2\left(SO_4\right)_3+3Cu\)
tỉ lệ 2 : 3 : 1 : 3
b. \(2Fe+3Cl_2\rightarrow2FeCl_3\)
tỉ lệ 2 : 3 : 2
c. \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
tỉ lệ 1 : 6 : 2 : 3
\(a,4P+5O_2\xrightarrow{t^o}2P_2O_5\\ b,Fe_2O_3+2Al\xrightarrow{t^o} Al_2O_3+2Fe\\ c,2Na+Cl_2\xrightarrow{t^o}2NaCl\\ d,Cu+2AgNO_3\to Cu(NO_3)_2+2Ag\\ e,2Al+3Cl_2\xrightarrow{t^o}2AlCl_3\)
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(Fe_2O_3+2Al\rightarrow2Fe+Al_2O_3\)
\(2Na+Cl_2\rightarrow2NaCl\)
\(Cu+2AgNO_3\rightarrow Cu\left(NO_3\right)_2+2Ag\)
\(2Al+3Cl_2\rightarrow2AlCl_3\)