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a) Ta có: mFe = \(\frac{60,5.46,289}{100}\) \(\approx\) 28g
\(\Rightarrow\) mZn = 60,5 - 28 = 32,5g
b) PTPỨ: Zn + 2HCl \(\rightarrow\) ZnCl2 + H2 (1)
Fe + 2HCl \(\rightarrow\) FeCl2 + H2 (2)
Theo ptr (1): nH2 (1) = nZn = \(\frac{32,5}{65}\)= 0,5 mol
Theo ptr (2) : n H2 (2) = nFe = \(\frac{28}{56}\) = 0,5 mol
\(\Rightarrow\) VH2 = (nH2 (1) + nH2 (2) ) . 22,4 = (0,5 + 0,5).22,4=22,4 lít
c) Theo (1): nZnCl2 = nZn = 0,5 mol
\(\Rightarrow\) mZnCl2 = 0,5.136 = 68(g)
Theo (2): nFeCl2 = nFe = 0,5 mol
\(\Rightarrow\) mFeCl2 = 0,5 . 127 = 63,5 g
Gọi \(\left\{{}\begin{matrix}n_{Zn}=a\left(mol\right)\\n_{Fe}=b\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{15,68}{22,4}=0,7\left(mol\right)\\ m_{HCl}=200.27,375\%=54,75\left(g\right)\\ n_{HCl}=\dfrac{54,75}{36,5}=1,5\left(mol\right)\)
PTHH:
Zn + 2HCl ---> ZnCl2 + H2
a ----> 2a --------> a -----> a
Fe + 2HCl ---> FeCl2 + H2
b ---> 2b -------> b ------> b
Hệ pt \(\left\{{}\begin{matrix}65a+56b=43,7\\a+b=0,7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,5\left(mol\right)\\b=0,2\left(mol\right)\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}m_{Zn}=0,5.65=32,5\left(g\right)\\m_{Fe}=0,2.56=11,2\left(g\right)\end{matrix}\right.\)
\(m_{dd}=43,7+200-0,7.2=242,3\left(g\right)\\ \rightarrow\left\{{}\begin{matrix}C\%_{ZnCl_2}=\dfrac{0,5.136}{242,3}=28,06\%\\C\%_{FeCl_2}=\dfrac{0,2.127}{242,3}=10,48\%\\C\%_{HCl\left(dư\right)}=\dfrac{\left(1,5-0,5.2-0,2.2\right).36,5}{242,3}=1,51\%\end{matrix}\right.\)
\(n_{H_2}=\dfrac{15,68}{22,4}=0,7\left(mol\right)\\
pthh:\left\{{}\begin{matrix}Zn+H_2SO_4->ZnSO_4+H_2\\Fe+H_2SO_4->FeSO_{\text{ 4 }}+H_2\end{matrix}\right.\)
gọi số mol Zn là x , số mol Fe là y
=> 65x+56y=43,7
=> a+b=0,7
=>a=0,5 , b =0,2
=> \(m_{Zn}=0,5.65=32,5\\ m_{Fe}=43,7-32,5=11,2\left(G\right)\)
Zn +2 HCl----> ZnCl2 +H2(1)
Fe +2HCl----> FeCl2 +H2(2)
a) m\(_{Fe}=\)\(\frac{60,5.46,289}{100}=28\left(g\right)\)
m\(_{Zn}=60,5-28=32,5\left(g\right)\)
b) Ta có
n\(_{Fe}=\frac{28}{56}=0,5\left(mol\right)\)
Theo pthh2
n\(_{H2}=n_{Fe}=0,5\left(mol\right)\)
n\(_{Zn}=\frac{32,5}{65}=0,5\left(mol\right)\)
Theo pthh1
n\(_{H2}=n_{Zn}=0,5\left(mol\right)\)
ϵ n\(_{H2}=0,5+0,5=1\left(mol\right)\)
V\(_{H2}=1.22,4-22,4\left(l\right)\)
c) Theo pthh1
n\(_{ZnCl2}=n_{Zn}=0,5\left(mol\right)\)
m\(_{ZnCl2}=0,5.136=68\left(g\right)\)
Theo pthh2
n\(_{FeCl2}=n_{Fe}=0,5\left(mol\right)\)
m\(_{FeCl2}=0,5.127=63,5\left(g\right)\)
Chúc bạn học tốt
\(m_{Zn}=60,5-28=32,5g\\ n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\\ n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\\ pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,5 0,5 0,5
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,5 0,5 0,5
\(V_{H_2}=\left(0,5+0,5\right).22,4=22,4\left(L\right)\\ m_{Mu\text{ối}}=\left(0,5.136\right)+\left(0,5.127\right)=131,5g\)