a)\(X\left\{{}\begin{matrix}Al\\Fe\\Zn\end{matrix}\right.+HCl\rightarrow\left\{{}\begin{matrix}AlCl_3\\FeCl_2\\ZnCl_2\end{matrix}\right.+H_2}}\)
b)\(n_{H_2}=0,7\left(mol\right)\\ n_{H\left(H_2\right)}=n_{HCl\left(pu\right)}=n_{Cl\left(HClpu\right)}=1,4\left(mol\right)\\ m_{hh}=m_{KL}+m_{Cl}=29,6+35,5\cdot1,4=79,3\left(g\right)\)