Final answer:
There are approximately 0.050 moles of magnesium.
Step-by-step explanation:
To determine the number of moles of magnesium, we need to use Avogadro's number. Avogadro's number is approximately 6.022 × 10^23 atoms per mole.
Given that there are 3.01 × 10^22 atoms of magnesium:
Number of moles = (3.01 × 10^22) / (6.022 × 10^23)
Number of moles ≈ 0.050 mol
Therefore, there are approximately 0.050 moles of magnesium.