设C的个数为n
C4H10(g) +(3n+1)/2 O2(g)=(燃烧) nCO2(g)+ (n+1)H2O(l) 燃烧热=···
即 C4H10(g) +(13/2) O2(g)=(燃烧) 4CO2(g)+ 5H2O(l) 燃烧热=···