摘要:氢气(H2).一氧化碳(CO).辛烷(C8H18).甲烷(CH4)的热化学方程式分别为: H2 (g) + 1/2O2(g) == H2O (l) △H = -285.8 KJ/mol CO(g) + 1/2O2(g) == CO2(g) △H = -283 KJ/mol C8H18 (l) + 25/2O2(g) == 8CO2(g) + 9H2O (l) △H = -5518 KJ/mol CH4 (g) + 2O2(g) == CO2(g) + 2H2O (l) △H = -890.3 KJ/mol 相同质量的H2.CO.C8H18.CH4完全燃烧时.放出热量最少的是 A.H2 C.C8H18 (l) D.CH4 (g)

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