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a,\(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,5 1 0,5 0,5
\(V_{ddHCl}=\dfrac{1}{2}=0,5\left(l\right)\)
b,\(V_{H_2}=0,5.22,4=11,2\left(l\right)\)
c,\(C_{M_{ddFeCl_2}}=\dfrac{0,5}{0,5}=1M\)
\(a) n_{Fe_2O_3}= \dfrac{8}{160} = 0,05(mol)\\ Fe_2O_3 + 6HCl \to 2FeCl_3 + 3H_2O\\ n_{FeCl_3} = 2n_{Fe_2O_3} = 0,1(mol)\\ m_{FeCl_3} = 0,1.162,5 = 16,25(gam)\\ b) n_{HCl} = 6n_{Fe_2O_3} = 0,05.6 = 0,3(mol)\\ V_{dd\ HCl} = \dfrac{0,3}{0,5} = 0,6(lít)\\ c) V_{dd\ sau\ pư} = V_{dd\ HCl} =0,6(lít)\\ C_{M_{FeCl_3}} = \dfrac{0,1}{0,6} = 0,167M\)
PTHH:\(Fe_2O_3+HCl\rightarrow FeCl_3+3H_2O\)
\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)
a, Bảo toàn nguyên tố Fe:
\(n_{FeCl_3}=n_{Fe}=2n_{Fe_2O_3}=2.0,05=0,1\left(mol\right)\)
\(\Rightarrow m_{FeCl_3}=162,5.0,1=16,25\left(g\right)\)
b, Bảo toàn nguyên tố Cl:
\(n_{Hcl}=n_{Cl}=3n_{FeCl_3}=3.0,1=0,3\left(mol\right)\)
\(\Rightarrow V_{ddHCl}=\dfrac{n_{HCL}}{C_M}=\dfrac{0,3}{0,5}=0,6\left(l\right)\)
c,\(C_{M_{FeCl_3}}=\dfrac{n_{FeCl_3}}{V_{ddFeCl_3}}=\dfrac{0,1}{0,6}=0,17M\)
Câu 1
\(a)PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\
b)200ml=0,2l\\
n_{HCl}=0,2.1=0,2mol\\
n_{H_2}=n_{MgCl_2}=\dfrac{1}{2}n_{H_2}=\dfrac{1}{2}\cdot0,2=0,1mol\\
V_{H_2}=0,1.24,79=2,479l\\
c)C_{M_{MgCl_2}}=\dfrac{0,1}{0,2}=0,5M\)
a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b, Có lẽ phần này đề hỏi khối lượng sắt chứ bạn nhỉ?
\(n_{ZnCl_2}=0,4.2=0,8\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{FeCl_2}=0,8\left(mol\right)\Rightarrow m_{Fe}=0,8.56=44,8\left(g\right)\)
c, \(n_{H_2}=n_{FeCl_2}=0,8\left(mol\right)\Rightarrow V_{H_2}=0,8.22,4=17,92\left(l\right)\)
d, \(n_{HCl}=2n_{FeCl_2}=1,6\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{1,6}{0,4}=4\left(M\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,4\left(mol\right)\\n_{FeCl_2}=n_{H_2}=0,2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{HCl}=\dfrac{0,4}{2}=0,2\left(l\right)\\V_{H_2}=0,2\cdot22,4=4,48\left(l\right)\\C_{M_{FeCl_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\end{matrix}\right.\)
\(n_{Al}=\dfrac{6,75}{27}=0,25\left(mol\right)\)
PTHH :
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,25 0,75 0,25 0,375
\(a,V_{H_2}=0,375.22,4=8,4\left(l\right)\)
\(b,m_{HCl}=0,75.36,5=27,375\left(g\right)\)
\(m_{ddHCl}=\dfrac{27,375.100}{10,95}=250\left(g\right)\)
\(c,m_{AlCl_3}=0,25.133,5=33,375\left(g\right)\)
\(m_{ddAlCl_3}=6,75+250-\left(0,375.2\right)=256\left(g\right)\)
\(C\%_{AlCl_3}=\dfrac{33,375}{256}.100\%\approx13,04\left(\%\right)\)
a) \(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PTHH: `Fe + 2HCl -> FeCl_2 + H_2`
0,05->0,1----->0,05---->0,05
`=> V_{ddHCl} = (0,1)/2 = 0,05 (l)`
b) `V_{H_2} = 0,05.22,4 = 1,12 (l)`
c) `C_{M(FeCl_2)} = (0,05)/(0,05) = 1M`