Verified Answer :

Kimchicaik

22.99 mol in one gram of sodium, so: 12.5/22.99=0.543714659 mol.
Round it to whatever you need to.

JoshEast

mol of Na =  \(\frac{Mass of Na}{Molar Mass of Na}\)
 
                =  \(\frac{12.5g}{23.00g/mol}\)
 
                =  0.54 mol

# atoms of Na =  mol ×  avogadro's constant
  
                       =  0.54 mol  ×  [6.02 × 10²³]
 
                       =  3.25 × 10²³

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