| Columbium pentafluoride, CbF5, is obtained when the pentoxide is dissolved in hydrofluoric acid. |
| In one method, naphthalene is oxidized with vanadium pentoxide to give phthalic anhydride. |
| The phosphorus combines with the oxygen to form an oxide of phosphorus, known as phosphorus pentoxide. |
| It burns readily in air, and is converted into the pentoxide when fused with acid potassium sulphate. |
| The thin covering is composed of alternating layers of silicon dioxide and tantalum pentoxide. |
| The selenide was collected and dried in an atmosphere of nitrogen, and then in a vacuum, in presence of phosphorus pentoxide. |
