\(m_A=m_B=\frac{44,8}{2}=22,4\left(g\right)\) (1)
Ta có: \(M_A-M_B=8\Rightarrow M_A=M_B+8\left(g\right)\) (2)
\(n_A=\frac{22,4}{M_A}\left(mol\right)\)
\(n_B=\frac{22,4}{M_B}\left(mol\right)\)
Từ (1)(2) ⇒ \(n_A< n_B\)
Ta có: \(n_B-n_A=0,05\)
\(\Leftrightarrow\frac{22,4}{M_B}-\frac{22,4}{M_A}=0,05\)
\(\Rightarrow22,4M_A-22,4M_B=0,05M_AM_B\)
\(\Leftrightarrow22,4\left(M_A-M_B\right)=0,05\left(M_B+8\right)M_B\)
\(\Leftrightarrow22,4\times8=0,05M_B^2+0,4M_B\)
\(\Leftrightarrow179,2=0,05M_B^2+0,4M_B\)
\(\Leftrightarrow0,05M_B^2+0,4M_B-179,2=0\)
\(\Leftrightarrow\left[{}\begin{matrix}M_B=56\\M_B=-64\left(loại\right)\end{matrix}\right.\)
Vậy B là Fe
\(M_A=56+8=64\left(g\right)\) ⇒ A là Cu
