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  
=> \(m_{Zn}=0,5.65=32,5\\ m_{Fe}=43,7-32,5=11,2\left(G\right)\)
 

a) mFe= 46,289% x 60,5 \(\approx\) 28(g)

mZn=60,5 - 28= 32,5(g)

b) nFe= 28/56=0,5(mol)

nZn=32,5/65=0,5(mol)

PTHH: Fe + 2 HCl -> FeCl2 + H2

0,2_________0,4____0,2____0,2(mol)

Zn + 2 HCl -> ZnCl2 + H2

0,2___0,4___0,2____0,2(mol)

V(H2, tổng đktc)= (0,2+0,2).22,4=8,96(l)

c) m(muối)=mFeCl2+ mZnCl2= 0,2.127 + 0,2. 136= 52,6(g)

\(n_{H_2}=\dfrac{2,24}{22,4}=0,1(mol)\\ PTHH:Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{HCl}=2n_{H_2}=0,2(mol)\\ a,C_{M_{HCl}}=\dfrac{0,2}{0,1}=2M\\ b,n_{Fe}=n_{H_2}=0,1(mol)\\ \Rightarrow m_{Fe}=0,1.56=5,6(g)\\ \Rightarrow m_{Cu}=20-5,6=14,4(g)\\ c,\%m_{Fe}=\dfrac{5,6}{20}.100\%=28\%\\ \%m_{Cu}=100\%-28\%=72\%\)

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

PTHH: Zn + H2SO4 -> ZnSO4+ H2

nH2= 0,1(mol) -> nZn=nH2=0,1(mol)

=> mZn=0,1.65=6,5(g)

=> %mZn=(6,5/10).100=65%

=> %mCu=100% - 65%= 35%

a, \(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\)

b, \(n_{CH_3COOH}=0,1.2=0,2\left(mol\right)\)

Theo PT: \(n_{H_2}=\dfrac{1}{2}n_{CH_3COOH}=0,1\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)

c, Theo PT: \(n_{Zn}=\dfrac{1}{2}n_{CH_3COOH}=0,1\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{Zn}=\dfrac{0,1.65}{9,5}.100\%\approx68,42\%\\\%m_{Cu}\approx31,58\%\end{matrix}\right.\)