实验测得:101 kPa时,1 mol H2完全燃烧生成液态水,放出285.8 kJ的热量;1 mol CH4完全燃烧生成液态水和CO2,放出890.3 kJ的热量。下列热化学方程式的书写正确的是 |
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①CH4(g)+2O2(g)==CO2(g)+2H2O(l) ΔH=+890.3 kJ/mol ②CH4(g)+2O2(g)==CO2(g)+2H2O(l) ΔH=-890.3 kJ/mol ③CH4(g)+2O2(g)==CO2(g)+2H2O(g) ΔH=-890.3 kJ/mol ④2H2(g)+O2(g)==2H2O(l) ΔH=-571.6 kJ/mol A、仅有② B、仅有②④ C、仅有②③④ D、全都符合要求 |