试题与答案

已知25 ℃、101 kPa下,下列反应C(石墨) + O2(g) === CO

题型:选择题

题目:

已知25 ℃、101 kPa下,下列反应C(石墨) + O2(g) === CO2(g) ,燃烧1 mol C(石墨)放热393.51 kJ。C(金刚石) + O2(g) === CO2(g),燃烧1 mol C(金刚石)放热395.41 kJ。可以得出的结论是[ ]

A.金刚石比石墨稳定

B.1 mol石墨所具有的能量比1 mol金刚石低

C.金刚石转变成石墨是物理变化

D.石墨和金刚石都是碳的同位素

答案:

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