Posted by gine2 on Tuesday, January 11, 2011 at 5:45am.
You need to calculate how many moles of Na you have and then use that each mole of any substance contains 6.02 x 10^23 particles (in this case atoms).
So number of moles of Na is
2.5 g /23 g mole^-1
hence calculate the number of atoms knowing that each mole contains
6.02x10^23 atoms.
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