\(m_C=\dfrac{13,2}{44}\cdot12=3,6g\\ m_H=\dfrac{5,4}{18}\cdot2=0,6g\\ m_{H+C}=3,6+0,6=4,2< m_A\)
=>Trong A có C,H,O
Gọi CTPT A \(C_xH_yO_z\)
\(m_O=5,8-4,2=1,6g\\ \dfrac{12x}{3,6}=\dfrac{y}{0,6}=\dfrac{16z}{1,6}=\dfrac{58}{5,8}\\ =>x=3;y=6;z=1\)
Vậy CTPT A là \(C_3H_6O\)