There are multiple phosphorus oxides, each with its own molecular formula. Here are a few common ones:

* Phosphorus(III) oxide (P₄O₆): This is a white, crystalline solid with a pungent odor.

* Phosphorus(V) oxide (P₄O₁₀): This is a white, deliquescent solid. It is a powerful desiccant, meaning it readily absorbs moisture from the air.

It's important to specify which phosphorus oxide you're interested in to get the correct molecular formula.