Question

equivalent weight of O²-

Answer 1

The weight of a substance that will combine with or replace one mole of hydrogen or one-half mole of oxygen. The equivalent weight is equal to the atomic weight divided by the valence.
the question is so funny that O2 is a diatomic molecule and you are saying its a monoatomic molecule
For monoatomic, EW=Molecular weight/1
For Diatomic molecules EW=Molecular weight/2.......

Hydrogen has atomic weight 1.008 (rounded to three decimal places) and always assumes valence 1 in compounds, so its equivalent weight is 1.008. Oxygen has an atomic weight of 15.999 and always assumes valence 2 in compounds, so its equivalent weight is 7.9995.

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Answer 2

oxygen atomic weight is 15. 999 ...

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