题目内容

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= -283．0 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

2021-09-17

A.H2(g)

B.C8H18(l)

C.CO(g)

D.CH4(g)

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