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Which is an empirical formula P₂O₅? How is this determined?
How is the molecular formula different?
The molecular formula represents the actual number of atoms of each element in a molecule. It is often a whole number multiple of the empirical formula. So in the case of P₂O₅, the molecular formula would be P₄O₁₀ or a multiple of it, like P₈O₂₀.