A:C8H18(l)+ 252 O2(g)═8CO2(g)+9H2O(g)△H=﹣48.40 kJ•mol﹣1
B:C8H18(l)+ 252 O2(g)═8CO2(g)+9H2O(l)△H=﹣5 517.6 kJ•mol﹣1
C:C8H18(l)+ 252 O2(g)═8CO2(g)+9H2O(g)△H=+5 517.6 kJ•mol﹣1
D:2C8H18(l)+25O2(g)═16CO2(g)+18 H2O(l)△H=﹣5 517.6 kJ•mol﹣1