\(\left\{{}\begin{matrix}Zn:x\left(mol\right)\\Fe:y\left(mol\right)\end{matrix}\right.\)
Phần 1:
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1mol\)
\(BTe:n_{Zn}+n_{Fe}=n_{H_2}=2n_{HCl}\)
\(\Rightarrow x+y=0,1\left(1\right)\)
Phần 2:
\(n_{SO_2}=\dfrac{2,688}{22,4}=0,12mol\)
\(BTe:2n_{Zn}+3n_{Fe}=2n_{SO_2}\)
\(\Rightarrow2x+3y=2\cdot0,12\left(2\right)\)
Từ (1) và (2)\(\Rightarrow\left\{{}\begin{matrix}x=0,06\\y=0,04\end{matrix}\right.\)
\(m=m_{Zn}+m_{Fe}=0,06\cdot65+0,04\cdot56=6,14g\)