1.
(2018高二上·北京期中)
已知在25℃,101kPa下,1g液态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)ΔH=-48.40kJ·mol-1
B . C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1)ΔH=-5518kJ·mol-1
C . C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1)ΔH=-5518kJ
D . C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(g)ΔH=-5518kJ·mol-1