a)\(2Al+6HCl--.2AlCl3+3H2\)
x------------3x-------------------1,5x(mol)
\(Fe+2HCl--.FeCl2+H2\)
y------------2x----------------------y(mol)
b)\(m_{Cu}=6,4\left(g\right)\)
\(n_{HCl}=0,5.2=1\left(mol\right)\)
\(n_{H2}=\frac{11,2}{22,4}=0,5\left(mol\right)\)
Theo bài ta có hpt
\(\left\{{}\begin{matrix}3x+2y=1\\1,5x+y=0,5\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=\\\end{matrix}\right.\)
=>xem lại đề nha