题目内容

氢气、一氧化碳、辛烷、甲烷燃烧的热化学方程式分别为：H2(g)+O2(g)=H2O(l)；△H=－285.8kJ/mol CO(g)+ 1/2O2(g)=CO2(g)；△H=－282.6kJ/mol C8H18(l)+O2(g)=8CO2(g)+9H2O(l)；△H=－5472kJ/mol CH4(g)+2O2(g)=CO2(g)+2H2O(l)；△H=－889.6kJ/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

2021-09-17

A.H2(g)

B.CO(g)

C.C8H18(l)

D.CH4(g)

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