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\(a) Fe + 2HCl \to FeCl_2 + H_2\\ n_{FeCl_2} = n_{H_2} = n_{Fe} = \dfrac{5,6}{56} = 0,1(mol)\\ V_{H_2} = 0,1.22,4 = 2,24(lít)\\ b)m_{FeCl_2} = 0,1.127 = 12,7(gam)\\ c) n_{HCl} =2 n_{Fe} = 0,2(mol)\\ C_{M_{HCl}} = \dfrac{0,2}{0,2} = 1M\)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.1......0.2..........0.1..........0.1\)
\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{FeCl_2}=0.1\cdot127=12.7\left(g\right)\)
\(C_{M_{HCl}}=\dfrac{0.2}{0.2}=1\left(M\right)\)
a.b.c.\(n_{Al}=\dfrac{2,7}{27}=0,1mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,1 0,1 0,15 ( mol )
\(V_{H_2}=0,15.22,4=3,36l\)
\(m_{AlCl_3}=0,1.133,5=13,35g\)
d.\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,15 0,1 ( mol )
\(m_{Fe}=0,1.56=5,6g\)
\(1,\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ 2,\\ n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\Rightarrow n_{Mg}=n_{MgCl_2}=n_{H_2}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ 3,\\ m_{MgCl_2}=95.0,25=23,75\left(g\right)\\ 4,\\ H_2+CuO\rightarrow\left(t^o\right)Cu+H_2O\\ n_{Cu}=n_{H_2}=0,25\left(g\right)\\ m_{Cu}=0,25.64=16\left(g\right)\)
1. \(Mg+2HCl\rightarrow MgCl_2+H_2\)
2. \(n_{HCl}=\dfrac{m_{HCl}}{M_{HCl}}=\dfrac{18,25}{36,5}\approx0,5\left(mol\right)\)
Theo PTHH: \(n_{H_2}=\dfrac{1}{2}n_{HCl}\)
\(\Rightarrow n_{H_2}=\dfrac{1}{2}.0,5=0,25\left(mol\right)\)
\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,25.22,4=5,6\left(l\right)\)
3. Theo PTHH: \(n_{MgCl_2}=\dfrac{1}{2}n_{HCl}\)
\(\Rightarrow n_{MgCl_2}=0,25\left(mol\right)\)
\(m_{MgCl_2}=n_{MgCl_2}.M_{MgCl_2}=0,25.95=23,75\left(g\right)\)
4. \(H_2+CuO\rightarrow Cu+H_2O\)
Theo PTHH: \(n_{Cu}=n_{H_2}=0,25\left(mol\right)\)
\(\Rightarrow m_{Cu}=n_{Cu}.M_{Cu}=0,25.64=16\left(g\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2mol\)
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
0,2 0,2 0,2 0,2
a)\(V_{H_2}=0,2\cdot22,4=4,48l\)
b)\(m_{ZnSO_4}=0,2\cdot161=32,2g\)
\(m_{ddZnSO_4}=30+200-0,2\cdot2=229,6g\)
\(C\%=\dfrac{m_{ct}}{m_{dd}}\cdot100\%=\dfrac{32,2}{229,6}\cdot100\%=14,02\%\)
c)\(n_{CuO}=\dfrac{24}{80}=0,3mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,3 0,2 0,2
\(m_{rắn}=m_{Cu}=0,2\cdot64=12,8g\)
nZn=1365=0,2molnZn=1365=0,2mol
Zn+H2SO4→ZnSO4+H2Zn+H2SO4→ZnSO4+H2
0,2 0,2 0,2 0,2
a)VH2=0,2⋅22,4=4,48lVH2=0,2⋅22,4=4,48l
b)mH2SO4=0,2⋅98=19,6gmH2SO4=0,2⋅98=19,6g
C%=mctmdd⋅100%=19,6200⋅100%=9,8%C%=mctmdd⋅100%=19,6200⋅100%=9,8%
c)nCuO=2480=0,3molnCuO=2480=0,3mol
CuO+H2→Cu+H2OCuO+H2→Cu+H2O
0,3 0,2 0,2
mrắn=mCu=0,2⋅64=12,8g.
1)
a) Fe + 2HCl --> FeCl2 + H2
b) \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
0,15->0,3--->0,15-->0,15
=> VH2 = 0,15.22,4 = 3,36 (l)
c) mdd sau pư = 8,4 + 250 - 0,15.2 = 258,1 (g)
=> \(C\%_{FeCl_2}=\dfrac{0,15.127}{258,1}.100\%=7,38\%\)
2)
a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2-->0,4---->0,2--->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
mZnCl2 = 0,2.136 = 27,2 (g)
c) \(C_{M\left(dd.HCl\right)}=\dfrac{0,4}{0,2}=2M\)
d)
PTHH: A + 2HCl --> ACl2 + H2
0,2<--0,4
=> \(M_A=\dfrac{4,8}{0,2}=24\left(g/mol\right)\)
=> A là Mg(Magie)
\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{FeCl_2} = n_{Fe} =\dfrac{11,2}{56} = 0,2(mol)\\ m_{FeCl_2} = 0,2.127 = 25,4(gam)\\ c) n_{H_2} = n_{Fe} = 0,2(mol)\Rightarrow V_{H_2} = 0,2.22,4 = 4,48(lít)\\ d) n_{HCl} = 2n_{Fe} = 0,4(mol)\\ C\%_{HCl} = \dfrac{0,4.36,5}{300}.100\% = 4,867\%\)
`a)PTHH:`
`2Al + 6HCl -> 2AlCl_3 + 3H_2`
`0,2` `0,6` `0,3` `(mol)`
`n_[Al]=[5,4]/27=0,2(mol)`
`b)V_[H_2]=0,3.22,4=6,72(l)`
`c)m_[dd HCl]=[0,6.36,5]/10 . 100 =219(g)`
\(n_{AlCl_3}=\dfrac{26.7}{133.5}=0.2\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(.........0.6......0.2.......0.3\)
\(V_{H_2}=0.3\cdot22.4=6.72\left(l\right)\)
\(C\%HCl=\dfrac{0.6\cdot36.5}{300}\cdot100\%=7.3\%\)
2Al+6HCl-2AlCl3+3H2
0,5-------------0,5-----0,75
nAl=0,5 mol
m muối=0,5.133,5=66,75 g
VH2=0,75.22,4=16,8g
2
C% = 5/50 .100=10%