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\(PTHH:Zn+H_2SO_4\to ZnSO_4+H_2\\ CuO+H_2SO_4\to CuSO_4+H_2O\\ \Rightarrow n_{Zn}=n_{H_2}=\dfrac{4,48}{22,4}=0,2(mol)\\ \Rightarrow m_{Zn}=0,2.65=13(g)\\ \Rightarrow \%_{Zn}=\dfrac{13}{21}.100\%=61,9\%\\ \Rightarrow \%_{CuO}=100\%-61,9\%=38,1\%\\ \Rightarrow n_{CuO}=\dfrac{21-13}{80}=0,1(mol)\\ \Rightarrow \Sigma n_{H_2SO_4}=0,1+0,2=0,3(mol)\\ \Rightarrow V_{dd_{H_2SO_4}}=\dfrac{0,3}{0,5}=0,6(l)\)
\(n_{H_2}=\dfrac{3,36}{22,4}0,15(mol)\\ a,PTHH:Fe+H_2SO_4\to FeSO_4+H_2\\ b,n_{Fe}=n_{H_2}=0,15(mol)\\ \Rightarrow \%_{Fe}=\dfrac{0,15.56}{14,8}.100\%=56,76\%\\ \Rightarrow \%_{Cu}=100\%-56,76\%=43,24\%\\ c,n_{H_2SO_4}=0,15(mol)\\ \Rightarrow m_{dd_{H_2SO_4}}=\dfrac{0,15.98}{20\%}=73,5(g)\\ \Rightarrow V_{dd_{H_2SO_4}}=\dfrac{73,5}{1,4}=52,5(l)\)
a) PTHH: 2Al + 6 HCl -> 2 AlCl3 + 3 H2
x___________3x______________1,5x(mol)
Fe +2 HCl -> FeCl2 + H2
y___2y____y______y(mol)
b) Ta có: m(rắn)= mCu=0,4(g)
=> m(Al, Fe)=1,5-mCu=1,5-0,4=1,1(g)
nH2= 0,04(mol)
Ta lập hpt:
\(\left\{{}\begin{matrix}27x+56y=1,1\\1,5x+y=0,04\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,02\\y=0,01\end{matrix}\right.\)
=> mAl=27.0,02=0,54(g)
mFe=56.0,01=0,56(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: \(n_{HCl}=2n_{CuO}+6n_{Fe_2O_3}=1\left(mol\right)\)
\(\Rightarrow V_{ddHCl}=\dfrac{1}{0,5}=2\left(l\right)\)
PTHH:
\(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)
0,15 0,15
\(CaO+2HCl\rightarrow CaCl_2+H_2O\)
Ta có: \(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(\Rightarrow m_{CaCO_3}=0,15\cdot100=15\left(g\right)\)
\(\Rightarrow m_{CaO}=20,6-15=5,6\left(g\right)\)
\(\Rightarrow\%m_{CaCO_3}=\dfrac{15\cdot100}{20,6}\approx73\%\)
\(\Rightarrow\%m_{CaO}=100\%-73\%=27\%\)
\(n_{H2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
a) Pt : \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O|\)
1 1 1 1
0,1 0,1
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2|\)
1 1 1 1
0,2 0,2 0,2
b) \(n_{Zn}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(m_{Zn}=0,2.65=13\left(g\right)\)
\(m_{CuO}=21-13=8\left(g\right)\)
0/0CuO = \(\dfrac{8.100}{21}=38,1\)0/0
0/0Zn = \(\dfrac{13.100}{21}=61,9\)0/0
c) Có : \(m_{CuO}=8\left(g\right)\)
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
\(n_{H2SO4\left(tổng\right)}=0,1+0,2=0,3\left(mol\right)\)
\(V_{ddH2SO4}=\dfrac{0,3}{0,5}=0,6\left(l\right)\)
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