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Why Are Addition Reactions to N 2 Thermodynamically Unfavorable?
Journal of Physical Chemistry. A 2017 Februrary 10
Thermochemical data are used to show that, of the 89.9 kcal/mol difference between the endothermicity of H2 addition to N2 (ΔH = 47.9 kcal/mol) and the exothermicity of H2 addition to acetylene (ΔH = -42.0 kcal/mol), less than half is due to a stronger π bond in N2 than in acetylene. The other major contributor to the difference of 89.9 kcal/mol between the enthalpies of hydrogenation of N2 and acetylene is that the pair of N-H bonds that are created in the addition of H2 to N2 are significantly weaker than the pair of C-H bonds that are created in the addition of H2 to acetylene. The reasons for this large difference between the strengths of the N-H bonds in E-HN═NH and the C-H bonds in H2 C═CH2 are analyzed and discussed.
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