2M + 3Cl2 → 2MCl3
\(n_M=\dfrac{10,8}{M_M}\left(mol\right)\)
\(n_{MCl_3}=\dfrac{53,4}{M_M+106,5}\left(mol\right)\)
Theo PT: \(n_M=n_{MCl_3}\)
\(\Rightarrow\dfrac{10,8}{M_M}=\dfrac{53,4}{M_M+106,5}\)
\(\Rightarrow53,4M_M=10,8M_M+1150,2\)
\(\Rightarrow42,6M_M=1150,2\)
\(\Rightarrow M_M=27\)
Vậy M là kim loại nhôm Al