# What is the bond energy of H-O? Wikipedia disagrees with itself

What is the bond energy of H-O? Wikipedia disagrees with itself:

What is the right value?

• Look, both links are Wikipedia pages containing a table each. The table headers have superscript numbers seven $(^7$ and $^{[7]}),$ which refer to the entries from the list of references on the bottom of each page. These are the sources you should compare, not Wikipedia pages. Dec 24, 2020 at 12:23
• Sure, but for the french wikipedia, the link is broken, so I could not compare. For english wikipedia, the link is given the same as information in english wikipedia. Dec 24, 2020 at 12:26
• Plus 1,not really for the question that perhaps is a bit naive, but for having spotted the difference. I think this link should clarify why the pages show different values. Out of calculation, one should identify what O-H bond mean. en.m.wikipedia.org/wiki/Bond-dissociation_energy Dec 24, 2020 at 12:31
• thank you. Apparently, there are several values, depending on the environnement : O−H in water 497 O−H in methanol 440 Dec 24, 2020 at 12:35
• I think generally it's a prudent recommendation to avoid Wikipedia as a reference for precise scientific values. The CRC handbook is a gold standard for a reason.
– J...
Dec 25, 2020 at 14:58

$$D^\circ_{298}(\ce{H-O}) = \pu{(429.74\pm 0.03) kJ mol-1}.$$
The value has been taken from the article by Ruscic et al. [2]. Note that this value is strictly for the diatomic molecule $$\ce{OH}$$ in gas phase and is determined as the standard enthalpy change for the fission process
$$\ce{O-H → O + H}.$$