1. Convert grams of ozone to moles:

* Find the molar mass of ozone (O₃): 3 * 16.00 g/mol = 48.00 g/mol

* Divide the mass of ozone by its molar mass: 1.659 g / 48.00 g/mol = 0.03456 mol O₃

2. Convert moles of ozone to molecules:

* Use Avogadro's number (6.022 x 10²³ molecules/mol): 0.03456 mol O₃ * (6.022 x 10²³ molecules/mol) = 2.08 x 10²² molecules O₃

3. Calculate the number of oxygen atoms:

* Since each ozone molecule contains 3 oxygen atoms, multiply the number of molecules by 3: 2.08 x 10²² molecules O₃ * 3 atoms/molecule = 6.24 x 10²² oxygen atoms

Therefore, there are approximately 6.24 x 10²² oxygen atoms present in 1.659 grams of ozone gas.