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)
烷烃燃烧通式
CnH2n+2 + (3n+1)/2 O2 = CO2 + (n+1)H2O