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![](https://rs.olm.vn/images/avt/0.png?1311)
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,2 0,1 0,1
\(b,m_{FeCl_2}=0,1.127=12,7\left(g\right)\)
\(c,V_{HCl}=\dfrac{0,2}{2}=0,1\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
A. \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
Theo PTHH: \(n_{H_2}=n_{Fe}=0,4\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,4.22,4=8,96\left(l\right)\)
B. Theo PTHH: \(n_{FeCl_2}=n_{Fe}=0,4\left(mol\right)\)
\(m_{FeCl_2}=0,4.127=50,8\left(g\right)\)
C. Nồng độ mol:
\(C_M=\dfrac{0,4}{0,3}=1,3\left(M\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Fe + 2HCl -> FeCl2 + H2
nFe = 5,6/56 = 0,1 mol
=>nH2 = 0,1 mol
=> VH2= 0,1*22,4= 2,24 lít
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: Fe + 2HCl ---> FeCl2 + H2
0,1-->0,2------------------>0,1
=> \(\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{0,2.36,5}{15\%}=\dfrac{146}{3}\left(g\right)\\V_{H_2}=0,1.22,4=4,48\left(l\right)\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1.a.2Al+6HCl\rightarrow2AlCl_3+3H_2\\ b.n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ TheoPT:n_{AlCl_3}=n_{Al}=0,4\left(mol\right)\\ \Rightarrow m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\\ c.TheoPT:n_{H_2}=\dfrac{3}{2}n_{Al}=0,6\left(mol\right)\\ \Rightarrow V_{H_2}=0,6.22,4=13,44\left(l\right)\)
\(2.a.Mg+2HCl\rightarrow MgCl_2+H_2\\ b.n_{HCl}=\dfrac{25,55}{36,5}=0,7\left(mol\right)\\ TheoPT:n_{Mg}=\dfrac{1}{2}n_{HCl}=0,35\left(mol\right)\\ \Rightarrow m_{Mg}=0,35.24=8,4\left(g\right)\\ c.TheoPT:n_{H_2}=\dfrac{1}{2}n_{HCl}=0,35\left(mol\right)\\ \Rightarrow V_{H_2}=0,35.22,4=7,84\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right);n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,15 0,3
Ta có: \(\dfrac{0,2}{1}>\dfrac{0,15}{1}\) ⇒ H2 pứ hết,Fe dư
\(V_{H_2}=3,36\left(l\right)\) (đề cho)
b, ko tính đc k/lg dd ,chỉ tính đc thể tích dd
\(V_{ddHCl}=\dfrac{0,2}{1}=0,2\left(l\right)=200\left(ml\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.2Al+6HCl->2AlCl_3+3H_2\\ b.m_{AlCl_3}=\dfrac{1}{3}.0,1.0,6.133,5=2,67g\\ c.V_{H_2}=\dfrac{1}{2}.0,06.24,79=0,7437\left(L\right)\\ d.a=\dfrac{1}{3}.0,1.0,6.27=0,54g\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Fe}=\dfrac{22,4}{56}=0,4\) (mol) (1)
Phương trình hóa học :
Fe + 2HCl ---> FeCl2 + H2 (2)
Từ (1) và (2) ta có \(n_{FeCl_2}=n_{H_2}=0,4\) (mol) ; \(n_{HCl}=0,8\left(mol\right)\)
b) => \(m_{\text{muối}}=0,4.\left(56+35,5.2\right)=50.8\left(g\right)\)
c) \(V_{\text{khí}}=0,4.22,4=8,96\left(l\right)\)
d) \(m_{HCl}=0,8.36.5=29,2\left(g\right)\)
\(\Rightarrow C\%=\dfrac{29,2}{200}.100\%=14,6\%\)
\(a/Fe+2HCl\xrightarrow[]{}FeCl_2+H_2\\ b/n_{H_2}=n_{FeCl_2}=0,1mol\\ m_{FeCl_2}=0,1.127=12,7\left(g\right)\\ c/V_{H_2}=0,1.22,4=2,24\left(l\right)\\ d/n_{HCl}=0,1.2=0,2\left(mol\right)\\ V_{HCl\left(pư\right)}=\dfrac{0,2}{2}=0,1\left(l\right)\)
\(c,V_{H_2}=0,1.22,4=2,24\left(l\right)\)
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