Hỗn hợp A: \(\left\{{}\begin{matrix}CO:a\left(mol\right)\\CO_2:b\left(mol\right)\\SO_2:b\left(mol\right)\end{matrix}\right.\)
Ta có: \(dA/H_2 =20,5\)
\(\Rightarrow\overline{M_A}=41\left(\dfrac{g}{mol}\right)\)
\(\Leftrightarrow41=\dfrac{28a+44b+64b}{a+b+b}\)
\(\Leftrightarrow41=\dfrac{28a+108b}{a+2b}\)
\(\Leftrightarrow a=2b\)
\(\Rightarrow\%V_{CO}=\dfrac{a.100}{a+b+b}=\dfrac{2b.100}{2b+b+b}=50\%\)
\(\%V_{CO_2}=\%V_{SO_2}=\dfrac{100-50}{2}=25\%\)