1. Avogadro's Number

* Avogadro's number tells us the number of atoms or molecules in one mole of a substance. It's approximately 6.022 x 10^23.

2. Conversion

* We can use Avogadro's number to convert between atoms and moles:

* moles = (number of atoms) / (Avogadro's number)

3. Calculation

* Let's plug in the numbers:

* moles = (2.01 x 10^22 atoms) / (6.022 x 10^23 atoms/mol)

* moles ≈ 0.0334 mol

Therefore, 2.01 x 10^22 atoms of Mg is approximately equal to 0.0334 moles.