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