Bảo toàn: C: \(n_C=n_{CO_2}=\dfrac{66}{44}=1,5\left(mol\right)\)
Bảo toàn H: \(n_H=2n_{H_2O}=\dfrac{2.40,5}{18}=4,5\left(mol\right)\)
Bảo toàn O: \(n_O=\dfrac{34,5-1,5.12-4,5}{16}=0,75\left(mol\right)\)
CTHH: CxHyOz
=> x : y : z = 1,5 : 4,5 : 0,5 = 2 : 6 : 1
=> (C2H6O)n = 46
=> n = 1
CTPT: C2H6O