General Chemistry
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Provide a balanced equation for reacting the specified element and excess O2.
Na
Na(s) + O2(g) → NaO2(s)
4Na(s) + 2O2(g) → 2Na2O(s)
2Na(s) + O2(g) → 2Na2O(s)
4Na(s) + O2(g) → 2Na2O(s)