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)＋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/molCH4(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

2021-09-17

A.H2(g)

B.CO(g)

C.C8H18(l)

D.CH4(g)

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