2Al + 3H2SO4 → Al2(SO4)3 + 3H2↑
\(n_{H_2}=\frac{5,6}{22,4}=0,25\left(mol\right)\)
Theo pT: \(n_{Al}=\frac{2}{3}n_{H_2}=\frac{2}{3}\times0,25=\frac{1}{6}\left(mol\right)\)
\(\Rightarrow m_{Al}=\frac{1}{6}\times27=4,5\left(g\right)\)
Chất rắn không tan là Ag \(\Rightarrow m_{Ag}=3\left(g\right)\)
\(\%m_{Al}=\frac{4,5}{4,5+3}\times100\%=60\%\)
\(\%m_{Ag}=100\%-60\%=40\%\)