已知25 ℃、101 kPa下,石墨、金刚石燃烧的化学方程式分别为:C(石墨

已知25 ℃、101 kPa下,石墨、金刚石燃烧的化学方程式分别为:C(石墨) + O2(g) = CO2(g)1 moL C(石墨) 完全燃烧放热393.51 kJC(金刚石) + O2(g) = CO2(g)1 moL C(金刚石) 完全燃烧  放热 395.41 kJ。据此推理所得到的下列结论中,正确的是(    )。

A.金刚石比石墨稳定                   B.石墨转化为金刚石是物理变化

    C.石墨的能量比金刚石的能量高    D.由石墨制备金刚石一定是吸热反应

答案

D

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