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April 19, 2014

April 19, 2014

Posted by **gine2** on Tuesday, January 11, 2011 at 5:45am.

- chemistry -
**Dr Russ**, Tuesday, January 11, 2011 at 6:28amYou 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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