A nitrogen oxide is 63.65% by mass nitrogen.The molecular formula could be ________. A)NO B)NO₂ C)N₂O D)N₂O₄ E)either NO₂or N₂O₄

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The molecular formula of nitrogen oxide is either NO or NO2. However, since the given compound has 63.65% nitrogen, its molecular formula must have at least one nitrogen atom. Therefore, the molecular formula of the compound could be N2O or N2O2. Only option C, N₂O, contains both nitrogen and oxygen atoms and has the correct ratio of nitrogen to oxygen atoms for both N2O and N2O2. Option A, NO, does not have enough nitrogen atoms, and options B and D contain sulfur atoms, which are not present in nitrogen oxide. Therefore, the best choice is C.

A Nitrogen Oxide Is 63