Respuesta :

21 moles of Magnesium

Explanation:
Moles of Mg= 1.25x10^25 atoms of Mg /6.02x10^23 atoms

6.02x10^23= Avogadro’s number or A

=20.7641196 moles of Magnesium or Mg
=21 moles of Magnesium or Mg

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