\(a,\) Gọi CT đơn giản nhất là \(C_xH_yO_z\)
\(\%m_{O}=100\%-42,11\%-6,43\%=51,46\%\\ x:y:z=\dfrac{\%_C}{12}:\dfrac{\%_H}{1}:\dfrac{\%_O}{12}=3,51:6,43:3,22\\ \Rightarrow x:y:z=12:22:11\\ \Rightarrow \text{CTĐGN của A là }(C_{12}H_{22}O_{11})_n\\ M_A=n.(12.12+22.1+11.16)=342\\ \Rightarrow n=1\\ \Rightarrow CTHH_A:C_{12}H_{22}O_{11}\)
\(b,d_{B/kk}=2,206\\ \Rightarrow M_B=2,206.29\approx 64(g/mol)\\ n_S=\dfrac{64.50\%}{32}=1(mol)\\ n_O=\dfrac{64.50\%}{16}=2(mol)\\ \Rightarrow CTHH_B:SO_2\)