Gọi CTHH ankan là \(C_nH_{2n+n}\)
\(C_nH_{2n+2}+\dfrac{3n+1}{2}O_2\underrightarrow{t^o}nCO_2+\left(n+1\right)H_2O\)
\(\dfrac{4,4}{14n+2}\) 0,4
Theo pt: \(\Rightarrow\dfrac{4,4\cdot\left(n+1\right)}{14n+2}=0,4\Rightarrow n=3\)
Vậy ankan đó là \(C_3H_8\)