Potassium superoxide
Potassium cations, K+ Superoxide anions, O−2 | |
| Names | |
|---|---|
| IUPAC name
Potassium superoxide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.574 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UN number | 2466 |
CompTox Dashboard (EPA) |
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| Properties | |
| KO2 | |
| Molar mass | 71.096 g·mol−1 |
| Appearance | yellow solid |
| Density | 2.14 g/cm3, solid |
| Melting point | 560 °C (1,040 °F; 833 K) (decomposes) |
| Hydrolysis | |
| +3230·10−6 cm3/mol | |
| Structure | |
| Body-centered tetragonal | |
| Thermochemistry | |
Std molar entropy (S⦵298) |
117 J/(mol·K) |
Std enthalpy of formation (ΔfH⦵298) |
−283 kJ/mol |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
Corrosive, oxidizer, reacts violently with water |
| GHS labelling: | |
| Danger | |
| H271, H314 | |
| P210, P220, P221, P260, P264, P280, P283, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P306+P360, P310, P321, P363, P370+P378, P371+P380+P375, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Related compounds | |
Other cations |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Potassium superoxide is an inorganic compound with the formula KO2. It is a yellow paramagnetic solid that decomposes in moist air. It is a rare example of a stable salt of the superoxide anion. It is used as a CO2 scrubber, H2O dehumidifier, and O2 generator in rebreathers, spacecraft, submarines, and spacesuits.