已知在25 ℃、101 kPa下,1 g C8H18(l)燃烧生成CO2和液态H2O时放出48.40 kJ的热量,表示上述反应的热化学方程式正确的是
A.C8H18(l)+O2(g)===8CO2(g)+9H2O(g)ΔH=-48.40 kJ·mol-1 |
B.C8H18(l)+O2(g)===8CO2(g)+9H2O(l)ΔH=-5 517.6 kJ·mol-1 |
C.C8H18(l)+O2(g)===8CO2(g)+9H2O(g) ΔH=+5 517.6 kJ·mol-1 |
D.2C8H18(l)+25O2(g)===16CO2(g)+18 H2O(l)ΔH=-5 517.6 kJ·mol-1 |