Gọi \(\left\{{}\begin{matrix}n_{CH4}:x\left(mol\right)\\n_{CO}:y\left(mol\right)\\n_{H2}:z\left(mol\right)\end{matrix}\right.\)
PTHH:
\(CH_4+2O_2\rightarrow CO_2+2H_2O\)
\(2CO+O_2\rightarrow2CO_2\)
\(2H_2+O_2\rightarrow2H_2O\)
\(x+y+z=1\)
\(\Rightarrow2x+0,5y+0,5z=0,8\Rightarrow2\left(2x+0,5y+0,5z\right)=1,6\)
\(\Rightarrow4x+y+z=1,6\)
\(\Leftrightarrow3x=0,6\Rightarrow x=0,2\)
\(\Rightarrow\%V_{CH4}=\frac{0,2}{1}.100\%=20\%\)