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a)
$Fe + 2HCl \to FeCl_2 + H_2$
n H2 = n Fe = 11,2/56 = 0,2(mol)
V H2 = 0,2.22,4 = 4,48(lít)
b)
n HCl = 2n Fe = 0,2.2 = 0,4(mol)
=> CM HCl = 0,4/0,4 = 1M
c)
$CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
Ta thấy :
n CuO = 64/80 = 0,8 > n H2 = 0,2 nên CuO dư
Theo PTHH :
n CuO pư = n Cu = n H2 = 0,2(mol)
n Cu dư = 0,8 - 0,2 = 0,6(mol)
Vậy :
%m Cu = 0,2.64/(0,2.64 + 0,6.80) .100% = 21,05%
%m CuO = 100% -21,05% = 78,95%
a) 2Al+6HCl→2AlCl3+3H22Al+6HCl→2AlCl3+3H2
b) nAl=5,427=0,2(mol)nAl=5,427=0,2(mol)
Theo phương trình : nH2=32nAl=0,3(mol)nH2=32nAl=0,3(mol)
→VH2(đktc)=0,3.22,4=6,72(l)→VH2(đktc)=0,3.22,4=6,72(l)
c) Chất rắn : 0,2(mol)0,2(mol)
CuO dư : 0,2(mol)Cu0,2(mol)Cu
%CuO=0,2.80(0,2.80+0,2.64).100=55,56%%CuO=0,2.80(0,2.80+0,2.64).100=55,56%
%Cu=44,44%%Cu=44,44%
a)\(n_{Al}=\dfrac{5,4}{27}=0,2mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2 0,3 0,1 0,3
b)\(V_{H_2}=0,3\cdot22,4=6,72l\)
c)\(n_{CuO}=\dfrac{32}{80}=0,4mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,4 0,3 0,3
\(m_{Cu}=0,3\cdot64=19,2g\)
nAl = 5.4/27 = 0.2 (mol)
2Al + 6HCl => 2AlCl3 + 3H2
0.2.......0.6......................0.3
CM HCl = 0.6 / 0.4 = 1.5 (M)
nCuO = 32/80 = 0.4 (mol)
CuO + H2 -to-> Cu + H2O
0.2.......0.2..........0.2
Chất rắn : 0.2 (mol) CuO dư , 0.2 (mol) Cu
%CuO =\(\dfrac{0,2.80}{0,2.80+0,2.64}\) 100% = 55.56%
%Cu = 44.44%
a) \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
b) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
Theo phương trình : \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\)
\(\rightarrow V_{H_2}\left(đktc\right)=0,3.22,4=6,72\left(l\right)\)
c) Chất rắn : \(0,2\left(mol\right)\)
CuO dư : \(0,2\left(mol\right)Cu\)
\(\%CuO=\dfrac{0,2.80}{\left(0,2.80+0,2.64\right)}.100=55,56\%\)
\(\%Cu=44,44\%\)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,2---------------------->0,3
=> VH2 = 0,3.22,4 = 6,72 (l)
b)
\(n_{CuO}=\dfrac{32}{80}=0,4\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
Xét tỉ lệ: \(\dfrac{0,4}{1}>\dfrac{0,3}{1}\) => CuO dư, H2 hết
PTHH: CuO + H2 --to--> Cu + H2O
0,3<--0,3------->0,3
=> Rắn sau pư gồm \(\left\{{}\begin{matrix}Cu:0,3\left(mol\right)\\CuO\left(dư\right):0,1\left(mol\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\%m_{Cu}=\dfrac{0,3.64}{0,3.64+0,1.80}.100\%=70,59\%\\\%m_{CuO}=\dfrac{0,1.80}{0,3.64+0,1.80}.100\%=29,41\%\end{matrix}\right.\)
\(n_{Al}=\dfrac{5,4}{27}=0,2mol\)
a)\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,6 0,3
\(C_M=\dfrac{0,6}{0,4}=1,5M\)
b)\(n_{CuO}=\dfrac{32}{80}=0,4mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,4 0,3 0,3
Sau phản ứng CuO dư và dư \(\left(0,4-0,3\right)\cdot80=8g\)
\(m_{rắn}=m_{Cu}=0,3\cdot64=19,2g\)
\(1,\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ 2,\\ n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\Rightarrow n_{Mg}=n_{MgCl_2}=n_{H_2}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ 3,\\ m_{MgCl_2}=95.0,25=23,75\left(g\right)\\ 4,\\ H_2+CuO\rightarrow\left(t^o\right)Cu+H_2O\\ n_{Cu}=n_{H_2}=0,25\left(g\right)\\ m_{Cu}=0,25.64=16\left(g\right)\)
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: \(n_{Cu}=n_{H_2}=0,25\left(mol\right)\)
\(\Rightarrow m_{Cu}=n_{Cu}.M_{Cu}=0,25.64=16\left(g\right)\)
\(n_{Fe}=\dfrac{16.8}{56}=0.3\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.3....................0.3.........0.3\)
\(m_{FeCl_2}=0.3\cdot127=38.1\left(g\right)\)
\(V_{H_2}=0.6\cdot22.4=6.72\left(l\right)\)
\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)
\(.......0.3...0.3\)
\(m_{Cu}=0.3\cdot64=19.2\left(g\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
a, Ta có: \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Theo PT: \(n_{FeCl_2}=n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=0,3.127=38,1\left(g\right)\)
b, Theo PT: \(n_{H_2}=n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PT: \(n_{Cu}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,3.64=19,2\left(g\right)\)
Bạn tham khảo nhé!
\(n_{Mg}=\dfrac{4.8}{24}=0.2\left(mol\right)\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(0.2.......0.4........................0.2\)
\(C_{M_{HCl}}=\dfrac{0.4}{0.2}=2\left(M\right)\)
\(n_{CuO}=\dfrac{32}{80}=0.4\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
Lập tỉ lệ : \(\dfrac{0.4}{1}>\dfrac{0.2}{1}\)
=> CuO dư
\(m_{cr}=m_{CuO\left(dư\right)}+m_{Cu}=32-0.2\cdot80+0.2\cdot64=28.8\left(g\right)\)
\(\%Cu=\dfrac{0.2\cdot64}{28.8}\cdot100\%=44.44\%\)
\(\%CuO\left(dư\right)=55.56\%\)
nZn = 13/65 = 0,2 (mol)
PTHH: Zn + H2SO4 -> ZnSO4 + H2
Mol: 0,2 ---> 0,2 ---> 0,2 ---> 0,2
VH2 = 0,2 . 22,4 = 4,48 (l)
nCuO = 32/80 = 0,4 (mol)
PTHH: CuO + H2 -> (r°) Cu + H2O
LTL: 0,4 > 0,2 => CuO dư
nCuO (p/ư) = nCu = 0,2 (mol)
mCuO (dư) = (0,4 - 0,2) . 80 = 16 (g)
mCu = 0,2 . 64 = 12,8 (g)
%mCuO = 16/(16 + 12,8) = 55,55%
%mCu = 100% - 55,55 = 45,45%
