Here's how to calculate the number of moles in 3.52 x 10^20 molecules of water:

Understanding the Relationship

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

Calculation

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

(3.52 x 10^20 molecules) / (6.022 x 10^23 molecules/mol) = 5.85 x 10^-4 moles

Answer: There are approximately 5.85 x 10^-4 moles of water in 3.52 x 10^20 molecules.