Ta có : \(n_X=\frac{2,52}{M_X}\left(mol\right)\), \(n_{XSO_4}=\frac{6,84}{M_X+96}\left(mol\right)\)
PTHH :
\(X+H_2SO_4\rightarrow XSO_4+H_2\uparrow\)
\(\frac{2,52}{M_X}\rightarrow\) \(\frac{2,52}{M_X}\) ( mol )
\(\Rightarrow\frac{2,52}{M_X}=\frac{6,84}{M_X+96}\)
\(\Rightarrow M_X=56\) \(\Rightarrow M:Fe\) ( Sắt )