Coi số mol hỗn hợp X = 1 mol.
\(\left\{{}\begin{matrix}n_{O2}=x\left(mol\right)\\n_{O3}=y\left(mol\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x+y=1\\32x+48y=1.18.2\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,75\\y=0,25\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{O2}=75\%\\\%V_{O3}=100\%-75\%=25\%\end{matrix}\right.\)