1. Understand the Chemical Formula:

* The formula P₂O₅ tells us that each molecule of diphosphorus pentoxide contains 2 phosphorus atoms and 5 oxygen atoms.

2. Calculate Moles of Oxygen Atoms:

* Since there are 5 moles of oxygen atoms for every mole of P₂O₅, we can use a simple ratio:

(5.00 mol P₂O₅) * (5 mol O / 1 mol P₂O₅) = 25.0 mol O

Answer: There are 25.0 moles of oxygen atoms present in 5.00 mol of diphosphorus pentoxide (P₂O₅).