question archive Phosphorus pentoxide is the most used name for ##P_4O_10##, the white molecular solid whose empirical formula is ##P_2O_5##
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Phosphorus pentoxide is the most used name for ##P_4O_10##, the white molecular solid whose empirical formula is ##P_2O_5##. It is the anhydride of phosphoric acid.
This is the image of the molecule from wikipedia.
For its avidity of water, it is one of the most powerful known dehydrating agent.