PT: \(2X+O_2\underrightarrow{t^o}2XO\)
Ta có: \(n_X=\frac{4,8}{M_X}\left(mol\right)\)
\(n_{XO}=\frac{8}{M_X+16}\left(mol\right)\)
Theo PT: \(n_X=n_{XO}\)
\(\Rightarrow\frac{4,8}{M_X}=\frac{8}{M_X+16}\)
\(\Rightarrow M_X=24\left(g/mol\right)\)
Vậy: X là Mg.
Bạn tham khảo nhé!