\(m_{\text{bình 1 tăng}}=m_{H_2O}=1.8\left(g\right)\)
\(\Rightarrow n_{H_2O}=\dfrac{1.8}{18}=0.1\left(mol\right)\)
\(\Rightarrow n_H=0.1\cdot2=0.2\left(mol\right)\)
\(m_{\text{bình 2 tăng}}=m_{CO_2}=3.52\left(g\right)\)
\(\Rightarrow n_{CO_2}=\dfrac{3.52}{44}=0.08\left(mol\right)\)
\(\Rightarrow n_C=0.08\left(mol\right)\)
\(m_O=m_A-m_C-m_H=1.48-0.08\cdot12-0.2=0.32\left(g\right)\)
Vậy A có 3 nguyên tố : C , H , O
\(n_O=\dfrac{0.32}{16}=0.02\left(mol\right)\)
\(n_A=\dfrac{1.48}{74}=0.02\left(mol\right)\)
Đặt : CT là : \(C_xH_yO_z\)
\(x=\dfrac{n_C}{n_A}=\dfrac{0.08}{0.02}=4\)
\(y=\dfrac{n_H}{n_A}=\dfrac{0.2}{0.02}=10\)
\(z=\dfrac{n_O}{n_A}=\dfrac{0.02}{0.02}=1\)
CTPT của A là : \(C_4H_{10}O\)