\(Fe+2HCl\rightarrow FeCl_2+H_2\)
Chất rắn không tan : Cu
\(m_{Cu}=3.2\left(g\right)\Rightarrow m_{Fe}=8-3.2=4.8\left(g\right)\)
\(\%Fe=\dfrac{4.8}{8}\cdot100\%=60\%\)
\(\%Cu=100\%-60\%=40\%\)
\(m_{rắn}=m_{Cu}=3,2g\\ \%m_{Cu}=\dfrac{3,2}{8}\cdot100\%=40\%\\ \%m_{Fe}=100\%-40\%=60\%\)