摘要:4.已知在25℃.101kPa下.lgC8H18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

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