①饱和烷烃燃烧通式
CnH2n+2 + (3n+1)/2 O2 = CO2 + (n+1)H2O
②烃的通式
烷烃 CnH2n+2 (n≥1),
烯烃 CnH2n (n≥2),
炔烃 CnH2n-2 (n≥2),
芳香烃 CnH2n-6 (n≥6)