1. Molecular Formula:

* Oxygen exists as a diatomic molecule (O₂).

2. Atomic Mass:

* The atomic mass of one oxygen atom is approximately 16 atomic mass units (amu).

3. Molecular Mass:

* Since an oxygen molecule (O₂) has two oxygen atoms, its molecular mass is 16 amu/atom * 2 atoms = 32 amu.

4. Converting to Grams:

* 1 amu is approximately equal to 1.66054 × 10⁻²⁴ grams.

* Therefore, the mass of one oxygen molecule is 32 amu * 1.66054 × 10⁻²⁴ g/amu ≈ 5.31 × 10⁻²³ grams.

In summary:

* The mass of one oxygen molecule (O₂) is approximately 5.31 × 10⁻²³ grams.