1.沼气是一种能源,它的主要成分是CH4,常温下,0.5 mol CH4完全燃烧生成CO2(g)和液态水时,放出445 kJ热量,则热化学方程式为
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答案: CH4(g)+2O2(g)===CO2(g)+2H2O(l)
ΔH=-890 kJ·mol-1