CnHn-6 + 3/2 (n - 1)O2             n CO2 + (n - 3)H2O

n(CO2) = 4,48л / 22.4 л/моль = 0,2 моль

n(CnH2n-6) = 2,65 / 14 · n-6 моль                по уравнению

2,65 / 14n-6 = 0,2 / n                               2,65n = (14n – 6) · 0,2

                                                                 2,65n = 2,8n – 1,2

                                                                 0,15n = 1,2

 Формула:       C8H10                                   n = 8