1. Convert grams to moles:

* Molar mass of O₂: 16 g/mol (for oxygen) * 2 = 32 g/mol

* Moles of O₂: (5.2 g O₂) / (32 g/mol O₂) = 0.1625 mol O₂

2. Calculate the number of O₂ molecules:

* Avogadro's number: 6.022 x 10²³ molecules/mol

* Number of O₂ molecules: (0.1625 mol O₂) * (6.022 x 10²³ molecules/mol) = 9.79 x 10²² molecules O₂

3. Determine the number of oxygen atoms:

* Each O₂ molecule has 2 oxygen atoms: (9.79 x 10²² molecules O₂) * (2 atoms O/molecule O₂) = 1.96 x 10²³ oxygen atoms

Therefore, there are approximately 1.96 x 10²³ oxygen atoms present in 5.2 grams of O₂.