Selenium trioxide
Selenium trioxide is an inorganic compound with formula SeO3.
- 1Names
- 2Formulae and structures
- 3Properties
- 4Constituents
- 5Thermodynamic properties
- 6Solubility
- 7Preparations
- 8Chemical reactions
- 9References
- 10Related substances
- 11Related categories
Names
List of substance names
- Typical name
- Selenium trioxide
- Compositional nomenclature
- Selenium trioxide
- Additive nomenclature
- Trioxidoselenium
- Other names
- Selenium(VI) oxide
- Selenic anhydride
Formulae and structures
List of formulae
- Typical formula
- SeO3
- Molecular formula
- SeO3
- Compositional formula
- SeO3
- Structural formula
- Structural formula with no conjugation
- Resonance structures
- Lewis structure
- Colored Lewis structure
Properties
List of substance properties
- Name
- Selenium trioxide
- Formula
- SeO3
- Appearance
- Colorless solid
- Odor
- Odorless
- Molar mass
- 126.968 g/mol
- Density
- –
- Melting point
- –
- Boiling point
- –
Constituents
Constituent atoms
| Atom | Name | Oxidation state | Number |
|---|---|---|---|
| Se | Selenium | +6 | 1 |
| O | Oxygen | −2 | 3 |
Ratio of atoms
| Atom | Atomic weight | Number | Atomic ratio | Weight ratio |
|---|---|---|---|---|
| Se | 78.971 | 1 | 25.00% | 62.20% |
| O | 15.999 | 3 | 75.00% | 37.80% |
Thermodynamic properties
Phase transition properties
- Enthalpy of fusion
- –
- Enthalpy of vaporization
- –
- Enthalpy of vaporization at 25°C
- –
- Enthalpy of other transition
- –
Standard thermodynamic properties
State | Standard enthalpy of formation ΔfH° kJ · mol−1 | Standard Gibbs energy of formation ΔfG° kJ · mol−1 | Standard molar entropy S° J · K−1 · mol−1 | Standard molar heat capacity at constant pressure Cp° J · K−1 · mol−1 |
|---|---|---|---|---|
| Crystalline solid | −166.9[1] | – | – | – |
Solubility
Qualitative solubility
Preparations
Reaction of nonmetal and nonmetal
The reaction of and can yield selenium trioxide.
Reaction of oxoacid salt and dehydrating acid
The reaction of oxoacid salt and dehydrating acid can yield selenium trioxide.
Decomposition
Decomposition of thermally decomposable substance can yield selenium trioxide.
Chemical reactions
Reaction with base
The reaction of base and selenium trioxide yields oxoacid salt and water.
Reaction with basic oxide
The reaction of basic oxide and selenium trioxide yields oxoacid salt.
Reaction with water
The reaction of selenium trioxide and water yields selenic acid.
Reaction with oxoacid
The reaction of oxoacid and selenium trioxide yields acidic oxide and selenic acid.
Reaction with anion
The reaction of selenium trioxide and oxide ion yields selenate ion.
Reaction with reducing nonmetal
The reaction of and selenium trioxide yields elementary substance/oxide and .
Reaction with reducing species
The reaction of reducing species and selenium trioxide yields a variety of products.
Reaction with oxidizable species under acidic condition
The reaction of oxidizable species, selenium trioxide, and hydrogen ion yields a variety of products.
Reaction with oxidizable species
The reaction of oxidizable species and selenium trioxide yields a variety of products.
Reaction with hardly oxidizable species under acidic condition
The reaction of hardly oxidizable species, selenium trioxide, and hydrogen ion yields a variety of products.
Decomposition
Decomposition of selenium trioxide yields a variety of products.
References
List of references
- 1Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)
