\(33,6(l) \to 3,36(l)\\ Zn+H_2SO_4 \to ZnSO_4+H_2\\ n_{H_2}=0,15(mol)\\ n_{Zn}=n_{H_2}=0,15(mol)\\ a/\\ \%m_{Zn}=\frac{0,15.65}{15,75}.100\%=61,9\%\\ \%m_{Cu}=38,06\%\\ b/\\ n_{ZnSO_4}=n_{H_2}=0,15(mol)\\ m_{ZnSO_4}=0,15.161=24,15(g)\)

ta co cu khong pu voi h2so4 zn td tao ra khi la h2,viet pt tinh mol suy he pt tinh mol cua zn tinh khoi luong zn lay hh ban dau - khoi luong zn tim duoc khoi luong cu .b)tu khi suy he pt tinh mol muoi roi tinh khoi luong

\(n_{H_2}=\dfrac{3,36}{22,4}=0,15(mol)\\ Zn+H_2SO_4\to ZnSO_4+H_2\\ \Rightarrow n_{Zn}=0,15(mol)\\ \Rightarrow \%_{Zn}=\dfrac{0,15.65}{15,75}.100\%=61,9\%\\ \Rightarrow \%_{Cu}=100\%-61,9\%=38,1\%\\ b,n_{ZnSO_4}=0,15(mol)\\ \Rightarrow m_{ZnSO_4}=0,15.161=24,15(g)\)

\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: Fe + H₂SO₄ --> FeSO₄ + H₂

_____0,15<--------------0,15<---0,15

=> m_Fe = 0,15.56 = 8,4 (g)

=> m_Cu = 11,6 - 8,4 = 3,2 (g)

\(\left\{{}\begin{matrix}\%Fe=\dfrac{8,4}{11,6}.100\%=72,414\%\\\%Cu=\dfrac{3,2}{11,6}.100\%=27,586\%\end{matrix}\right.\)

m_FeSO4 = 0,15.152 = 22,8 (g)

a) 

\(n_{H_2}=\dfrac{9,916}{24,79}=0,4\left(mol\right)\)

PTHH: Zn + H₂SO₄ --> ZnSO₄ + H₂

_____0,4<---0,4<--------0,4<----0,4

=> m_Zn = 0,4.65 = 26 (g)

=> \(\left\{{}\begin{matrix}\%Zn=\dfrac{26}{51,6}.100\%=50,388\%\\\%Cu=\dfrac{51,6-26}{51,6}.100\%=49,612\text{%}\end{matrix}\right.\)

b) 

m_ZnSO4 = 0,4.161 = 64,4 (g)

c) 

\(V_{ddH_2SO_4}=\dfrac{0,4}{2}=0,2\left(l\right)\)

a) \(n_{Zn}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: Zn + H₂SO₄ --> ZnSO₄ + H₂

_____0,15<-------------0,15<---0,15

=> m_Zn = 0,15.65 = 9,75(g)

=> \(\left\{{}\begin{matrix}\%Zn=\dfrac{9,75}{17,75}.100\%=54,93\%\\\%Cu=100\%-54,93\%=45,07\%\end{matrix}\right.\)

b) m_ZnSO4 = 0,15.161=24,15(g)

Cu ko phản ứng với H2SO4 loãng

\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)

\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(\Rightarrow m_{Zn}=0,1.65=6,5\left(g\right)\Rightarrow m_{Cu}=4\left(g\right)\)

\(\Rightarrow\%Zn=\dfrac{6,5}{10,5}=62\%;\%Cu=100\%-62\%=28\%\)

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