A sample of oxygen was enriched with oxygen-18 and had the
following composition: 75% oxygen-16 and...

Question

A sample of oxygen was enriched with oxygen-18 and had the
following composition: 75% oxygen-16 and 25% oxygen-18. The oxygen sample
burned in sodium to form sodium oxide, Na2O.
Write a balanced equation for the
reaction.I got 2Na + O = Na2O... but isnt oxygen diatomic?

David · Accepted Answer

Solution:250113_74581_1 
16O has eight neutrons in its nucleus and 18O has ten neutrons in its nucleus; both isotopes have 
same number of protons and electrons. Both isotopes have same electronic configuration – 
[He] 2s22p4. Since chemical reactions depend on the outer orbital electrons,

A sample of oxygen was enriched with oxygen-18 and had the following composition: 75% oxygen-16 and 25% oxygen-18. The oxygen sample burned in sodium to form sodium oxide, Na 2 O. Write a balanced...

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