Co \(m_X-m_y=0\\ m_X+m_y=44,8\)\(\Rightarrow\left\{{}\begin{matrix}m_X=22,4\left(g\right)\\m_Y=22,4\left(g\right)\end{matrix}\right.\)
\(n_X=\dfrac{22,4}{M_X}=\dfrac{22,4}{M_Y+8}\\ n_Y=\dfrac{22,4}{M_Y}\)\(\Rightarrow\dfrac{22,4}{M_Y}-\dfrac{22,4}{M_Y+8}=0,05\Rightarrow M_Y=56\Rightarrow\)Y la Fe
Từ đó suy ra X là Cu