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2.88 grams Na2SO4 (1 mole Na2SO4/142.05 grams)(6.022 X 1023/1 mole Na2SO4)(1 mole Na2SO4 atoms/6.022 X 1023)

= 0.020 moles of sodium sulfate atoms

------------------------------------------------------( you can see the last two steps are superfluous )

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