Đặt \(n_{CH_4}=x;n_{C_2H_4}=y;n_{C_2H_2}=z\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}x+y+z=0,8\left(1\right)\\x+y=0,6\left(2\right)\end{matrix}\right.\)
\(\frac{m_{CO_2}}{m_{H_2O}}=\frac{44n_{CO_2}}{18n_{H_2O}}=\frac{22}{9}\\ \Rightarrow n_{CO_2}=n_{H_2O}\\ \Rightarrow n_{CH_4}=n_{C_2H_2}\Rightarrow x=z\left(3\right)\)
\(\left(1\right);\left(2\right);\left(3\right)\Rightarrow\left\{{}\begin{matrix}x=0,2\\y=0,4\\z=0,2\end{matrix}\right.\)