m tăng= m kim loại- mH2
\(\Rightarrow n_{H2}=22,75-22,05=0,7\left(g\right)\)
\(\Rightarrow n_{H2}=0,35\left(mol\right)\)
\(2R+nH_2SO_4\rightarrow R_2\left(SO_4\right)_n+nH_2\)
\(\Rightarrow n_R=\frac{0,7}{n}\left(mol\right)\)
\(\Rightarrow M_R=32,5n\)
\(n=2\Rightarrow M_R=65\left(Zn\right)\)