Let's write Avogadro's number first:
1 mol Mg = 24.30 g = 6.022x10^23 atoms (it could be molecules, ions, etc.)
Procedure:
24.30 g Mg ------ 6.022x10^23 atoms Mg
x ------- 4.130x10^23 atoms Mg
x = 16.67 g Mg
Answer: 16.67 g Mg
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