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The page says it's about dioxygen…[edit]
We need to to explain dioxygen clearly in the infobox: Our 'Physical properties' section is already about O₂ so we should call it 'Molecular properties' and list its formula and molar mass:
- Molecular properties
- |Chemical formula = O₂
- |Molar mass = 31.998 g⋅㏖⁻¹
- |Odor = Low concentrations: none
Thecurran (talk) 13:54, 29 May 2017 (UTC)
- All the physical properties listed are already for dioxygen. Properties are always provided for the elements in their standard states (e.g. N2, O2, P4, S8). Atomic oxygen is not really something you can bottle. Double sharp (talk) 14:22, 29 May 2017 (UTC)
- The molar mass of dioxygen isn't listed anywhere. Thecurran (talk) 07:48, 16 June 2017 (UTC)
- Because it is obvious: take the mass of an oxygen atom and multiply it by 2. Double sharp (talk) 08:05, 16 June 2017 (UTC)
- For every other chemical page we write up the molar mass for convenience and uniformity and also because bonding energies make molar masses differ slightly from the sum of the individual atomic masses. Put yourself in the shoes of a foreigner, novice, or youngster trying to calculate the number of moles of O₂₍ɢ₎ and every other reactant and product of a combustion reaction, given their masses. Such a reader would correctly use the molar masses from all the other pages but incorrectly use our non-uniform atomic 'weight' of O and get the question wrong. Thecurran (talk) 01:28, 17 June 2017 (UTC)
- I was under the impression that in your first year of chemistry you learnt to calculate the molar mass from just glancing at your periodic table and adding the atomic masses of the individual elements. If you need it spelled out for you that the molar mass of H2SO4 is about 98 g/mol, and can't just glance at the table and add 2(1) + 32 + 4(16), then either you have not been paying attention or your teacher has set a new record for not doing a good job. The bond energy is practically negligible anyway at this scale. We do not spoonfeed the reader thus either for the pages on H2, N2, F2, P4, S8, Cl2, Br2, and I2; why should oxygen be an exception? Double sharp (talk) 02:10, 17 June 2017 (UTC)
- re For every other chemical page we write up the molar mass: we do that with compounds only. In elements, we stay closer to the atomic being. Although I think we could mention the main allotropes (O2 and O3) -DePiep (talk) 12:05, 17 June 2017 (UTC)
- The molar mass of dioxygen isn't listed anywhere. Thecurran (talk) 07:48, 16 June 2017 (UTC)
Image caption misleading[edit]
The caption for the infobox image is "Liquid oxygen, boiling in beaker at room temperature" – this seems misleading, as neither the oxygen nor the beaker are at room temperature. Does "Liquid oxygen, boiling at −183°C" sound like a better caption? Does the temperature need to be mentioned at all? anowlcalledjosh 🦉 (talk) 13:48, 27 July 2017 (UTC)
- Indeed, better not mention actual temperature(s). Even saying "b.p. is −183 °C" could be incorrect, because we don't know pressure. "Liquid oxygen, boiling"? -DePiep (talk) 14:18, 27 July 2017 (UTC)
Done Double sharp (talk) 15:10, 27 July 2017 (UTC)
Semi-protected edit request on 29 May 2020[edit]
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2604:3D08:5B80:1A00:5547:98E3:B96E:A0BE (talk) 19:08, 29 May 2020 (UTC)
Atomic Radius= 60pm
