Xenon trioxide

Xenon trioxide
General
Systematic name	xenon trioxide xenon(VI) oxide
Molecular formula	XeO3
Molar mass	179.288 g/mol
Appearance	colorless crystalline solid
CAS number	[13776-58-4]
Properties
Density and phase	4.55 g/cm3, solid
Solubility in water	Soluble (with reaction)
Melting point	25 °C Violent Decomposition
Acidity (pKa)	?
Structure
Molecular shape	trigonal pyramidal
Bond length	? pm (Xe−O)
Dipole moment	?
Thermodynamic data
Standard enthalpy of formation ΔfH°solid	402 kJ/mol
Standard molar entropy S°solid	? J.K−1.mol−1
Hazards
EU classification	not listed
NFPA 704	NFPA 704 safety square 4 3 4
Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Related compounds	Perxenic acid Xenon tetroxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Xenon trioxide is an unstable compound of xenon in its +6 oxidation state. It is a very powerful oxidizing agent, and liberates oxygen (and xenon) from water slowly, accelerated by exposure to sunlight. It is dangerously explosive upon contact with organic materials.

When it dissolves in water, an acidic solution of xenic acid is formed:

XeO_{3(aq) + H2O → H2XeO4 → H^{+ + HXeO4−}}

References

1. Webelements periodic table: page on Xenon(VI) oxide