Problem: If the empirical formula of sodium oxide is Na 2O, can you tell me how to write a balanced chemical equation for this reaction. You already answered the question but why did you start with 4Na +O2. How do I know to start with 4 Na? And then how do I know it produces 2 Na2O. 

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If the empirical formula of sodium oxide is Na 2O, can you tell me how to write a balanced chemical equation for this reaction. You already answered the question but why did you start with 4Na +O2. How do I know to start with 4 Na? And then how do I know it produces 2 Na2O. 

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