1.热化学方程式判断正误
典例1.已知在25℃、101kPa下,1g C8H18(辛烷)燃烧生成二氧化碳和液态水放出48.40 kJ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(l)ΔH=-48.40kJ·mol−1
B.C8H18(l)+O2(g)=8CO2(g) + 9H2O(l)ΔH=-5518kJ·mol−1
C.C8H18(l)+O2(g)=8CO2(g) + 9H2O(l)ΔH=+5518kJ·mol−1
D.C8H18(l)+O2(g)=8CO2(g) + 9H2O(l)ΔH=+48.40kJ·mol−1