Understanding the Concept

* Avogadro's Number: This fundamental constant tells us that there are 6.022 x 10^23 particles (atoms, molecules, etc.) in one mole of any substance.

Calculation

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

(4.5 x 10^28 molecules) / (6.022 x 10^23 molecules/mole)

2. Simplify the calculation:

This gives you approximately 74.7 moles of sodium fluoride (NaF).

Therefore, there are approximately 74.7 moles in 4.5 x 10^28 molecules of sodium fluoride.