Uranium trioxide
Uranium trioxide (UO3), also called uranyl oxide, uranium(VI) oxide, and uranic oxide, is an oxide of uranium. UO3 is a hexavalent oxide, which means that the uranium in the compound has an oxidation state of +6. It can be formed by heating uranyl nitrate to 400 °C.
| Names | |
|---|---|
| IUPAC names
Uranium trioxide Uranium(VI) oxide | |
| Other names
Uranyl oxide Uranic oxide | |
| Identifiers | |
| ECHA InfoCard | 100.014.274 |
| Properties | |
| UO3 | |
| Molar mass | 286.29 g/mol |
| Appearance | yellow-orange powder |
| Density | 5.5–8.7 g/cm3 |
| Melting point | ~200–650 °C (decomposes) |
| Partially soluble | |
| Structure | |
| see text | |
Space group |
I41/amd (γ-UO3) |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
−1230 kJ·mol−1[1] |
| Standard molar entropy S |
99 J·mol−1·K−1[1] |
| Hazards | |
| EU classification | Very toxic (T+) Dangerous for the environment (N) |
| NFPA 704 |
0
4
1
|
| R-phrases | R26/28, R33, R51/53 |
| S-phrases | (S1/2), S20/21, S45, S61 |
| Flash point | Non-flammable |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is  ?) | |
| Infobox references | |
UO3 is a poisonous and slightly radioactive substance. It can be harmful if it is breathed in, ingested, or makes contact with skin.
References
- Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A23. ISBN 0-618-94690-X.
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