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There are several homework problems that require using Avogadro's Number to convert moles to formula units. I know that whether you write the answer in terms of molecules or atoms it will be the same, but are there certain cases where your final answer should be in terms of one or the other?
It mainly depends on whether the question specifically asks for molecules or atoms. Obviously, if the question refers to a single element, then it would be atoms. Otherwise, it mainly depends on what the question asks for.
Kind of like what Timothy said, you'd want to see what "things" the problem is dealing with. For example, if the question was asking for the number of H2O, you'd want the answer in molecules because it would be incorrect to say a certain number of H2O "atoms". If the question was asking for the number of C, the answer would be in atoms.
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