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a) $2Al + 3Cl_2 \xrightarrow{t^o} 2AlCl_3$
b) $n_{Al} = \dfrac{5,4}{27} = 0,2(mol)$
Theo PTHH : $n_{Cl_2} = \dfrac{3}{2}n_{Al} = 0,3(mol)$
$\Rightarrow V_{Cl_2} = 0,3.24,79 = 7,437(lít)$
c) $n_{AlCl_3} = n_{Al} = 0,2(mol)$
$\Rightarrow m_{AlCl_3} = 0,2.133,5 = 26,7(gam)$
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{HCl}=0,2.36,5=7,3\left(g\right)\\
m_{ZnCl_2}=1360,1=13,6\left(g\right)\\
V_{H_2}=0,1.22,4=2,24\left(l\right)\)
a. Cu+Cl2-> CuCl2
1 1 1 (mol)
0,2 0,2 0,2(mol)
nCu=m/M=12,8:64=0,2 mol
b. VCl2= n.22,4= 0,2.22,4= 4,48 (l)
c. mCl2= n.M=0,2. 71= 14,2 g
K nha
a, PTHH:\(Cu+Cl_2\rightarrow CuCl_2\)
b, \(n_{Cu}=\frac{m}{M}=\frac{12,8}{64}=0,2\left(mol\right)\)
Ta thấy \(n_{CuCl_2}=n_{Cl_2}=n_{Cu}=0,2\left(mol\right)\)
\(V_{Cl_2}=n_{Cl_2}.22,4=0,2.22,4=4,48\left(l\right)\)
c, \(m_{CuCl_2}=n_{CuCl_2}.M=0,2.135=27\left(g\right)\)
nFe = 16.8/56 = 0.3 (mol)
3Fe + 2O2 -to-> Fe3O4
0.3......0.2...........0.1
VO2 = 0.2*22.4 = 4.48 (l)
mFe3O4 = 0.1*232 = 23.2 (g)
a, PT: \(2Zn+O_2\underrightarrow{t^o}2ZnO\) - pư hóa hợp.
b, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{Zn}=0,1\left(mol\right)\Rightarrow V_{O_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{H_2SO_4}=\dfrac{9,8}{98}=0,1\left(mol\right)\)
PT: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,1}{1}\), ta được Zn dư.
Theo PT: \(n_{H_2}=n_{H_2SO_4}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(n_{ZnSO_4}=n_{H_2SO_4}=0,1\left(mol\right)\Rightarrow m_{ZnSO_4}=0,1.161=16,1\left(g\right)\)
a) Fe + 2HCl \(\rightarrow\) FeCl2 + H2
b) nFe = 0,56 : 56 = 0,01 mol
Theo pt: nFeCl2 = nFe = 0,01 mol
=> mFeCl2 = 0,01.127 = 1,27g
c) Theo pt : nH2 = nFe = 0,01 mol
=> VH2 = 0,01.22,4 = 0,224 lít
Chúc em học tốt !!!
\(a.\)
\(n_{Na}=\dfrac{4.6}{23}=0.2\left(mol\right)\)
\(Na+\dfrac{1}{2}Cl_2\underrightarrow{t^0}NaCl\)
\(0.2........0.1........0.2\)
\(V_{Cl_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{NaCl}=0.2\cdot58.5=11.7\left(g\right)\)
\(b.\)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{t^0}FeCl_3\)
\(0.1.......0.15.......0.1\)
\(V_{Cl_2}=0.15\cdot22.4=3.36\left(l\right)\)
\(m_{FeCl_3}=0.1\cdot162.5=16.25\left(g\right)\)
\(c.\)
\(n_{Cu}=\dfrac{6.4}{64}=0.1\left(mol\right)\)
\(Cu+Cl_2\underrightarrow{t^0}CuCl_2\)
\(0.1......0.1.....0.1\)
\(V_{Cl_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{CuCl_2}=0.1\cdot135=13.5\left(g\right)\)
Bài 1:
a. \(n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right)\)
\(2Na+Cl_2\rightarrow2NaCl\)
0,2 ...... 0,1 ..... 0,2 (mol)
\(\rightarrow\left\{{}\begin{matrix}V_{Cl_2}=0,1.22,4=2,24\left(l\right)\\m_{NaCl}=0,2.58,5=11,7\left(g\right)\end{matrix}\right.\)
b. \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(2Fe+3Cl_2\rightarrow2FeCl_3\)
0,1 ...... 0,15 ...... 0,1 (mol)
\(\rightarrow\left\{{}\begin{matrix}V_{Cl_2}=0,15.22,4=3,36\left(l\right)\\m_{FeCl_3}=0,1.162,5=16,25\left(g\right)\end{matrix}\right.\)
c. \(n_{Cu}=\dfrac{6,4}{64}=0,1\left(mol\right)\)
\(Cu+Cl_2\rightarrow CuCl_2\)
0,1 .... 0,1 ..... 0,1 (mol)
\(\rightarrow\left\{{}\begin{matrix}V_{Cl_2}=0,1.22,4=2,24\left(l\right)\\m_{CuCl_2}=0,1.135=13,5\left(g\right)\end{matrix}\right.\)