A 74.00 g sample of a compound known to contain only nitrogen and oxygen is found to contain 22.53 g N. Its molar mass is determined to be 92.02 g/mol. Calculate its molecular formula.

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answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.