Gọi số mol Al, Fe là a, b
\(m_{Cu}=m_B=6,4\left(g\right)\)
=> \(m_{Al}+m_{Fe}=17,4-6,4=11\left(g\right)\)
=> 27a + 56b = 11
\(n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
b----------------------->b
2Al + 6HCl --> 2AlCl3 + 3H2
a------------------------>1,5a
=> 1,5a + b = 0,4
=> a = 0,2; b = 0,1
=> \(\left\{{}\begin{matrix}m_{Fe}=0,1.56=5,6\left(g\right)\\m_{Al}=0,2.27=5,4\left(g\right)\end{matrix}\right.\)