题目内容

氢气（H 2）、一氧化碳（CO）、辛烷（C 8H 18）、甲烷（CH 4）的热化学方程式分别为：H 2(g) + 1/2O 2(g) = H 2O(l) △H =-285.8kJ/molCO(g) + 1/2O 2(g) = CO 2(g) △H =-283.0kJ/molC 8H 18(l) + 25/2O 2(g) = 8CO 2(g) + 9 H 2O(l) △H =-5518.0kJ/molCH 4(g) + 2O 2(g) = CO 2(g) + 2 H 2O(l) △H =-890.3kJ/mol相同质量的H 2、CO、C 8H 18、CH 4完全燃烧时，放出热量最少的是

2021-09-17

A.CO(g)

B.H2(g)

C.C8H18(l)

D.CH4(g)

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