Bảo toàn nguyên tố: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)=n_C\\n_H=2n_{H_2O}=2\cdot\dfrac{1,8}{18}=0,2\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow m_{hidrocacbon}=m_C+m_H=0,1\cdot12+0,2\cdot1=1,4\left(g\right)\)
Chọn B