Gọi a, b, c là mol Cu, Fe, Al trong 0,5 mol X
\(\Rightarrow a+b+c=0,5\left(1\right)\)
Bảo toàn e:\(2b+3c=0,4.2=0,8\left(2\right)\)
Gọi ka, kb, kc là mol mỗi KL trong 47,6g X
\(\Rightarrow k\left(64a+56b+27c\right)=47,6\left(\text{*}\right)\)
\(n_{Cl2}=1,3\left(mol\right)\)
Bảo toàn e: \(k\left(2a+3b+3c\right)=1,3.2=2,6\left(\text{*}\text{*}\right)\)
(*)(**) \(\Rightarrow k=\frac{47,6}{64a+56b+27c}=\frac{2,6}{2a+3b+3c}\)
\(\Rightarrow2,6\left(64a+56b+27c\right)=47,6\left(2a+3b+3c\right)\)
\(\Rightarrow71,2a+2,8b-72,6c=0\left(3\right)\)
(1)(2)(3) \(\Rightarrow\left\{{}\begin{matrix}a=0,2\\b=0,1\\c=0,2\end{matrix}\right.\)
\(\Rightarrow\%_{Al}=22,69\%\)
