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a,\(n_{HCl}=0,5.1=0,5\left(mol\right)\)
PTHH: CuO + 2HCl → CuCl2 + H2O
Mol: x 2x
PTHH: Fe2O3 + 6HCl → 2FeCl3 + 3H2O
Mol: y 6y
Ta có: \(\left\{{}\begin{matrix}80x+160y=16\\2x+6y=0,5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,05\end{matrix}\right.\)
PTHH: CuO + 2HCl → CuCl2 + H2O
Mol: 0,1 0,2
PTHH: Fe2O3 + 6HCl → 2FeCl3 + 3H2O
Mol: 0,05 0,3
\(\Rightarrow m_{CuO}=0,1.80=8\left(g\right);m_{Fe_2O_3}=16-8=8\left(g\right)\)
b,\(\%m_{CuO}=\dfrac{8.100\%}{16}=50\%;\%m_{Fe_2O_3}=100-50=50\%\)
\(a.Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ b.n_{H_2SO_4}=0,22.1,25=0,275mol\\ n_{Fe_2O_3}=a;n_{CuO}=b\\ \Rightarrow\left\{{}\begin{matrix}3a+b=0,275\\160a+80b=16\end{matrix}\right.\\ \Rightarrow a=0,075;b=0,05\\ \%m_{Fe_2O_3}=\dfrac{0,075.160}{16}\cdot100=75\%\\ \%m_{CuO}=100-75=25\%\)
\(a/ZnO+2HCl\rightarrow ZnCl_2+H_2O\\ Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\\ b/n_{HCl}=\dfrac{250.7,3}{100}:36,5=0,5mol\\ n_{ZnO}=a;n_{Fe_2O_3}=b\\ \Rightarrow\left\{{}\begin{matrix}81a+160b=16,1\\2a+6b=0,5\end{matrix}\right.\\ \Rightarrow a=b=0,1mol\\ \%m_{ZnO}=\dfrac{0,1.81}{16,1}\cdot100=50,3\%\\ \%m_{Fe_2O_3}=100-50,3=49,7\%\\ c/C_{\%ZnCl_2}=\dfrac{136.0,1}{16,1+250}\cdot100=5\%\\ C_{\%FeCl_3}=\dfrac{0,1.2.162,5}{16,1+250}=12\%\)
a) CuO + 2HCl ⟶CuCl2 + 2H2O
6HCl + Fe2O3 → 2FeCl3 + 3H2O
Gọi x, y lần lượt là số mol CuO, Fe2O3
\(\left\{{}\begin{matrix}80x+160y=16\\135x+162,5.2y=29,75\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}x=0,1\\y=0,05\end{matrix}\right.\)
=> \(\%m_{CuO}=\dfrac{0,1.80}{16}.100=50\%\)
\(\%m_{Fe_2O_3}=100-50=50\%\)
b) \(n_{HCl}=2n_{CuO}+6n_{Fe_2O_3}=0,5\left(mol\right)\)
=> \(CM_{HCl}=\dfrac{0,3}{0,1}=3M\)
PTHH: \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
a________a (mol)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
b________3b (mol)
Ta lập HPT: \(\left\{{}\begin{matrix}80a+160b=16\\a+3b=0,25\cdot1=0,25\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,05\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,1\cdot80}{16}\cdot100\%=50\%\\\%m_{Fe_2O_3}=50\%\end{matrix}\right.\)
Gọi n CuO = a ( mol )
n Fe2O3 = b ( mol )
Có : n H2SO4 = 0,25 ( mol )
PTHH
CuO + H2SO4 ===> CuSO4 + H2O
a-----------a
Fe2O3 + 3H2SO4 ===> Fe2(SO4)3 + 3H2O
b-----------3b
Ta có hpt
\(\left\{{}\begin{matrix}80a+160b=16\\a+3b=0,25\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a=0,1\\b=0,05\end{matrix}\right.\)
=> m CuO = 8 ( g ) , m Fe2O3 = 8 ( g )
=> %m CuO = %m Fe2O3 = 50 %
a)
nNaOH = 0,04.1 = 0,04 (mol)
PTHH: NaOH + HCl --> NaCl + H2O
0,04--->0,04
=> nHCl(pư với X) = 0,2.1 - 0,04 = 0,16 (mol)
Gọi số mol CuO, Fe2O3 là a, b (mol)
=> 80a + 160b = 4,8 (1)
PTHH: CuO + 2HCl --> CuCl2 + H2O
a----->2a
Fe2O3 + 6HCl --> 2FeCl3 + 3H2O
b----->6b
=> 2a + 6b = 0,16 (2)
(1)(2) => a = 0,02; b = 0,02
=> \(\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,02.80}{4,8}.100\%=33,33\%\\\%m_{Fe_2O_3}=\dfrac{0,02.160}{4,8}.100\%=66,67\%\end{matrix}\right.\)
b) Chất rắn thu được gồm CuO, Fe2O3
Bảo toàn Cu: nCuO = 0,02 (mol)
Bảo toàn Fe: nFe2O3 = 0,02 (mol)
=> m = 0,02.80 + 0,02.160 = 4,8 (g)
a, \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
b, Gọi: \(\left\{{}\begin{matrix}n_{CuO}=x\left(mol\right)\\n_{Fe_2O_3}=y\left(mol\right)\end{matrix}\right.\) ⇒ 80x + 160y = 32 (1)
Theo PT: \(\left\{{}\begin{matrix}n_{CuCl_2}=n_{Cu}=x\left(mol\right)\\n_{FeCl_3}=2n_{Fe_2O_3}=2y\left(mol\right)\end{matrix}\right.\) ⇒ 135x + 325y = 59,5 (2)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,2\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CuO}=0,2.80=16\left(g\right)\\m_{Fe_2O_3}=0,1.160=16\left(g\right)\end{matrix}\right.\)
c, Theo PT: \(n_{HCl}=2n_{CuO}+6n_{Fe_2O_3}=1\left(mol\right)\)
\(\Rightarrow V_{ddHCl}=\dfrac{1}{0,5}=2\left(l\right)\)
\(Fe_2O_3\left(a\right)+6HCl\left(6a\right)->2FeCl_3\left(2a\right)+3H_2O\)
\(CuO\left(b\right)+2HCl\left(2b\right)->CuCl_2\left(b\right)+H_2O\)
a) Gọi a,b lần lượt là sm của Fe2O3 , CuO
\(n_{HCl}=0,5\left(mol\right)\)
Ta có: \(\left\{{}\begin{matrix}160a+80b=16\\3a+b=0,25\end{matrix}\right.=>\left\{{}\begin{matrix}a=0,05\\b=0,1\end{matrix}\right.\)
\(\Rightarrow\%m\)
b) \(m_{FeCl_3}=0,1.162,5=16,25g\)
\(m_{CuCl_2}=13,5g\)
c) \(C\%ddFeCl_2=\dfrac{16,25}{266}.100\%=6,1\%\)
\(C\%ddCuCl_2=5\%\)