键能

键能通常指在标准状态下气态分子拆开成气态原子时，每种化學鍵所需能量的平均值。

对双原子分子来说，键能就是键的离解能。

	${\ce {H}}$	${\ce {F}}$	${\ce {Cl}}$	${\ce {Br}}$	${\ce {I}}$	${\ce {OH}}$	${\ce {N}}$	${\ce {NH2}}$
${\ce {H-X}}$	104 (436)	135 (570)	103 (431)	87 (366)	71 (298)	119 (498)	110 ( 460)	—
${\ce {CH3-X}}$	105 (440)	109 (452)	84 (352)	70 (293)	56 (236)	91 (382)	—	87 (365)

关系

键能是热力学能的一部分。
键焓与键能近似相等。
气态分子的原子化能等于全部键能之和。

参见

这是一篇與化学相關的小作品。您可以通过编辑或修订扩充其内容。

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