已知在25℃,101kPa下,l g C8H18(辛烷)燃烧生成二氧化碳和液态水时放出48.40kJ热量。表示上述反应的热化学方程式正确的是
A.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(g)△H=-48.40kJ·mol-1 |
B.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1)△H=-5518kJ·mol-1 |
C.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1)△H=+5518kJ·mol-1 |
D.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1) △H=-48.40kJ·mol-1 |