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Slide 5 of this power point ( https://www.slideshare.net/smartensen/mole-calculations) has a good diagram to show how to convert from atoms, moles, grams and liters!
Yes, Avogadro's number represents the number of objects, in this case, atoms, in 1 mole. For problem E7, you divide the given number of atoms (2.1 x 10^9) by Avogadro's number (6.022 x 10^23) to determine the number of moles of carbon present.
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