Understanding the Key Concept

* Avogadro's Number: One mole of any substance contains 6.022 x 10^23 particles (atoms, molecules, etc.). This is Avogadro's number.

Calculation

1. Set up a conversion factor:

(1 mole Al / 6.022 x 10^23 atoms Al)

2. Multiply the given number of atoms by the conversion factor:

(5.2 x 10^24 atoms Al) * (1 mole Al / 6.022 x 10^23 atoms Al)

3. Cancel out the units of "atoms Al" and perform the calculation:

(5.2 / 6.022) moles Al ≈ 0.863 moles Al

Answer: 5.2 x 10^24 atoms of aluminum represent approximately 0.863 moles of aluminum.