Xenon trioxide
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| Xenon trioxide | |
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 |
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| 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 |
3
4
4
OX
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| 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 |
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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:
XeO3(aq) + H2O → H2XeO4 → H+ + HXeO4−
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