题型：单选题 题类：常考题 难易度：普通
广西壮族自治区桂林市第十八中学2018-2019学年高二（理)上学期化学期中考试试卷
①CH4(g)+2O2(g)=CO2(g)+2H2O(l) ΔH=+890.3 kJ·mol−1
②CH4(g)+2O2(g)=CO2(g)+2H2O(l) ΔH=−890.3 kJ·mol−1
③CH4(g)+2O2(g)=CO2(g)+2H2O(g) ΔH=−890.3 kJ·mol−1
④2H2(g)+O2(g)=2H2O(l) ΔH=−571.6 kJ·mol−1
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