氢气、一氧化碳、辛烷、甲烷燃烧的热化学方程式分别为: H2(g)+1/2O2(g)=H2O(l) △H=-285.8kJ/mol CO(g)+1/2O2(g)=CO2(g) △H=-283.0kJ/mol C8H18(l)+25/2O2(g)=8CO2(g)+9H2O(l) △H=-5518kJ/mol CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-890.3kJ/mol 相同质量的氢气、一氧化碳、辛烷、甲烷完全燃烧时,放出热量最少的是 |
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A.H2(g) B.CO(g) C.C8H18(l) D.CH4(g) |