摘要：已知在25℃.101kPa下1g C8H18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(l)+ 25/2O2(g)＝8CO2(g)+9H2O(g)△H＝–48.40kJ/mol B C8H18(l)+ 25/2O2(g)＝8CO2(g)+9H2O(l)△H＝–-5518kJ/mol C C8H18(l)+ 25/2O2(g)＝8CO2(g)+9H2O(g)△H＝+5518kJ/mol D C8H18(l)+ 25/2O2(g)＝8CO2(g)+9H2O(l)△H＝+48.40kJ/mol

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