Talk:Copper oxide

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Why is more CuO formed than Cu2O? Does it have a higher enthalpy of formation? This would be great if it could be added to the article.

• Copper(III) Oxide (percupric oxide, Cu₃O), the main product when copper is heated in air. It is not common.

Deleted by me, can anyone correct this for usage? Wslack 15:56, 5 July 2006 (UTC)

I'm not an expert, but I recently learned in chem class that the roman numerals refer to the charge of the cation, not to the number of atoms within the compound. Cu(III) would mean Cu³⁺, not Cu₃. If there is a copper(III) oxide, then given this, I'm pretty sure it would have to be Cu₂O₃ to balance out the charges. A couple of quick google searches indicate that this is either non-existent or a very rare (artificial?) compound called "copper sesquioxide". --Icarus ^(Hi!) 03:45, 3 October 2006 (UTC)