摘要：已知在25℃.101kPa下.l gC8H18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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