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Number of Atoms Given its Mass

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I'm thoroughly confusing myself, I know how to calc a formula mass and to determine from moles how to get the mass. But I'm not making the connection to count #atoms/molecule.

ex) What are the number of atoms of C-12 are there in 3.5 gram sample

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It shows how to find the number of atoms given the mass.

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You are confused because you need Avogadro's number - the ...

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