Understanding the Relationship

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

Calculation

1. Divide the number of atoms by Avogadro's number:

(4.2 x 10^24 Pb atoms) / (6.022 x 10^23 atoms/mol)

2. Simplify:

≈ 6.98 moles of Pb atoms

Answer: There are approximately 6.98 moles of Pb atoms in 4.2 x 10^24 Pb atoms.