\(m_X=0.3\cdot0.625\cdot64=12\left(g\right)\)
- Áp dụng phương pháp đường chéo .
\(\Rightarrow\dfrac{n_{O2}}{n_{CO2}}=\dfrac{1}{2}\)
Mà \(n_{CO2}+n_{O2}=\dfrac{V}{22,4}=0,3\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{CO2}=0,2\\n_{O2}=0,1\end{matrix}\right.\) ( mol )
\(\Rightarrow m=12g\)