已知在25℃,101kPa下,lgC8H18(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)+12.5O2(g)=8CO2(g)+9H2O(g) ∆H=-48.40kJ/mol |
B.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ∆H=-5518kJ/mol |
C.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ∆H=+5518kJ/mol |
D.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ∆H=-48.40kJ/mol |