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鍵離解能(Bond dissociation energy)縮寫為 D0 或 BDE,是絕對零度時共價鍵均裂生成原子或自由基的反應中焓的變化。[1]以乙烷(CH3CH3)為例,C-H鍵的第一離解能為:
鍵離解能是鍵強度的一種量度。鍵的離解能較小,鍵更容易裂解。
多原子分子的鍵離解能與鍵能是兩個不同的概念。
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