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Chemical compound From Wikipedia, the free encyclopedia
Phosphorus dioxide (PO2) is a gaseous oxide of phosphorus. It is a free radical that plays a role in the chemiluminescence of phosphorus and phosphine.[1] It is produced when phosphates are heated to high temperatures.[2]
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| Names | |
|---|---|
| IUPAC name
Phosphorus(IV) oxide | |
| Other names
Phosphorus dioxide | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| 1065 | |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| O2P | |
| Molar mass | 62.972 g·mol−1 |
| ThermochemistryCRC Handbook of Chemistry and Physics, 2005 | |
Heat capacity (C) |
39.5 joules (9.4 cal) per mole per K |
Std molar entropy (S⦵298) |
252.1 joules (60.3 cal) per mole per K |
Std enthalpy of formation (ΔfH⦵298) |
−279.9 joules (−66.9 cal) per mole |
Gibbs free energy (ΔfG⦵) |
−281.6 joules (−67.3 cal) per mole |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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In the ground state the molecule is bent, like nitrogen dioxide, but there is an excited state that is linear.[1]
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