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Ta có nH2 = 3,36/22,4 = 0,15 mol
Fe +2 HCl -> FeCl2 + H2
0,15. 0,3 <-. 0,15. ( Mol)
=> mFe = 0,15 × 56 = 8,4g
=> %Fe = 8,4/15×100% = 56%
=> %Cu = 100% - 56% = 44%
=>VHCl =1\0,3=10\3 l
a)
$Fe + 2HCl \to FeCl_2 + H_2$
$FeO + 2HCl \to FeCl_2 + H_2O$
b)
Theo PTHH : $n_{Fe} = n_{H_2} = \dfrac{3,36}{22,4} = 0,15(mol)$
$m_{Fe} = 0,15.56 = 8,4(gam)$
$m_{FeO} = 12 - 8,4 = 3,6(gam)$
$n_{FeO} =0,05(mol)$
Theo PTHH : $n_{HCl} = 2n_{Fe} + 2n_{FeO} = 0,4(mol)$
$V_{dd\ HCl} = \dfrac{0,4}{2} = 0,2(lít)$
c) $Fe + CuSO_4 \to FeSO_4 + Cu$
$n_{Cu} = n_{Fe} = 0,15(mol) \Rightarrow m_{chất\ rắn} = m_{FeO} + m_{Cu}$
$= 3,6 + 0,15.64 = 13,2(gam)$
a,\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: x x
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: y y
Ta có: \(\left\{{}\begin{matrix}65x+56y=30,7\\x+y=0,5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,3\left(mol\right)\\y=0,2\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\%m_{Zn}=\dfrac{0,3.65.100\%}{30,7}=63,52\%;\%m_{Fe}=100\%-63,52\%=36,48\%\)
b,
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,3 0,6
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,2 0,4
nHCl = 0,6+0,4 = 1 (mol)
\(V_{ddHCl}=\dfrac{1}{2}=0,5\left(l\right)=500\left(ml\right)\)
Gọi a, b lần lượt là mol của Al và Zn
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
a 1,5a
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b b
\(\Rightarrow\left\{{}\begin{matrix}27a+65b=9,2\\1,5a+b=\dfrac{5,6}{22,4}\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,1\end{matrix}\right.\)
\(\%m_{Al}=\dfrac{0,1.27}{9,2}.100\%=29,35\%\)
\(\%m_{Zn}=\dfrac{0,1.65}{9,2}.100\%=70,35\%\)
b. \(n_{H_2}=0,25mol\) \(\Rightarrow n_{HCl}=0,5mol\)
\(\Rightarrow m_{HCl}=0,5.36,5=18,25g\)
Ta có: \(10\%=\dfrac{18,25}{m_{dd}}.100\%\)
\(\Leftrightarrow m_{dd}=182,5g\)
a) Fe + 2HCl --> FeCl2 + H2
b) \(n_{HCl}=\dfrac{36,5.30}{100.36,5}=0,3\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
_____0,15<-0,3-------------->0,15
=> \(\%Fe=\dfrac{0,15.56}{8,8}.100\%=95,45\%\)
=> \(\%Cu=\dfrac{8,8-0,15.56}{8,8}.100\%=4,55\%\)
c) VH2 = 0,15.22,4 = 3,36(l)
\(a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ \Rightarrow n_{Zn}=n_{H_2}=\dfrac{3,7185}{24,79}=0.,15(mol)\\ \Rightarrow m_{Zn}=0,15.65=9,75(g)\\ \Rightarrow \%_{Zn}=\dfrac{9,75}{10}.100\%=97,5\%\\ \Rightarrow \%_{Cu}=100\%-97,5\%=2,5\%\\ b,n_{HCl}=2n_{H_2}=0,3(mol)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{0,3.36,5}{14\%}=78,21(g)\)
a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
Gọi: \(\left\{{}\begin{matrix}n_{Mg}=x\left(mol\right)\\n_{Fe}=y\left(mol\right)\end{matrix}\right.\) ⇒ 24x + 56y = 8 (1)
Theo PT: \(\left\{{}\begin{matrix}n_{MgCl_2}=n_{Mg}=x\left(mol\right)\\n_{FeCl_2}=n_{Fe}=y\left(mol\right)\end{matrix}\right.\) ⇒ 95x + 127y = 22,2 (2)
Từ (1) và (2) ⇒ x = y = 0,1 (mol)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Mg}=\dfrac{0,1.24}{8}.100\%=30\%\\\%m_{Fe}=70\%\end{matrix}\right.\)
b, \(n_{HCl}=2n_{Mg}+2n_{Fe}=0,4\left(mol\right)\)
\(\Rightarrow V_{ddHCl}=\dfrac{0,4}{1}=0,4\left(l\right)\)
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