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A 1.325 g sample of an unknown vapor occupies 386 mL at 114 celsius and 946 mmHg. The simplest formula of the compound is NO2. What is the molecular formula of the compound?

(I have N2O4, is this correct and if not, why not? We never went over this type of question in class!
Dr. Bob222, in answer to your question, I'm not sure if I know how to work this. I tried to. Could you walk me through it?!!

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