|Molar mass||286.29 g/mol|
|Melting point||~200–650 °C (decomposes)|
|Std enthalpy of
|EU classification||Very toxic (T+)|
Dangerous for the environment (N)
|R-phrases||R26/28, R33, R51/53|
|S-phrases||(S1/2), S20/21, S45, S61|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
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.
UO3 is a poisonous and slightly radioactive substance. It can be harmful if it is breathed in, ingested, or makes contact with skin.