Ta có:
\(n_{hh}=\frac{6,72}{22,4}=0,3\left(mol\right)\)
\(\Rightarrow n_{CH4}=0,2\left(mol\right);n_A=0,1\left(mol\right)\)
\(X+O_2\rightarrow CO_2+H_2O\)
\(n_{CO2}=\frac{22}{44}=0,5\left(mol\right)\)
\(n_{H2O}=\frac{14,4}{18}=0,8\left(mol\right)\)
\(\Rightarrow n_{H2O}-n_{CO2}=n_X\)
Vậy hidrocacbon A cũng là ankan có dạng CnH2n+2
\(\Rightarrow0,2.1+0,1.n=0,5\)
\(\Rightarrow n=3\)
Suy ra A là C3H8
CTCT: CH3−CH2−CH3