已知在25℃、101kPa下,1g C8H18(辛烷)燃烧生成二氧化碳和液态水时放出48.40kJ的热量。表示上述反应的热化学方程式正确的是( )
A.C8H18(l)+25/2O2(g)=8CO2(g)+9H2O(g)△H=-48.40kJ·mol-1 |
B.C8H18(l)+25/2O2(g)=8CO2(g)+9H2O(l)△H=-5518kJ·mol-1 |
C.C8H18(l)+25/2O2(g)=8CO2(g)+9H2O△H=+5518kJ·mol-1 |
D.C8H18(l)+25/2O2(g)=8CO2(g)+9H2O(l)△H=-48.40kJ·mol-1 |