Answer :

(4.0 moles of Na) x (6.02 x 10^23) / (1 mole) = 2.4 x 10^24 atoms of Na There are 2.4 x 10^24 atoms of Na in 4.0 moles.
If 1 mol = 6.022 x 10^23 atoms of anything, including, then ... 4.0 mol = 4 x 6.022 x 10^23 atoms Na = 2.4 x 10^24 atoms

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