(Answered) A sample of oxygen was enriched with oxygen-18 and had the

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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?

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