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Apparently NaN3 is an ionic compound, so the Na and N3 are attracted by their difference in charges. Na has an oxidation state of +1, but with the N3, we have to figure out the overall charge of each nitrogen via formal charges. How they have it N=N=N, the outermost Nitrogens have a formal charge of -1, while the middle Nitrogen has a formal charge of +1, so overall, the molecule is -1, which matches with our Na+, forming the ionic compound. They don't include the 2Na, I assume because we weren't supposed to find out what was happening to Na. The 3N2 has an overall charge of 0, since has both Nitrogens with a formal charge of 0. Therefore, overall, the nitrogen goes from -1 to 0, meaning it has been oxidized.
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