Molybdenum(VI) oxide
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| Molybdenum(VI) oxide | |
|---|---|
| Image:Molybdenum(VI) oxide.jpg | |
| General | |
| Systematic name | Molybdenum trioxide Molybdenum(VI) oxide |
| Other names | Molybdic anhydride Molybdite |
| Molecular formula | MoO3 |
| Molar mass | 143.94 g/mol |
| Appearance | white solid |
| CAS number | [1313-27-5] |
| Properties | |
| Density and phase | 4.7 g/cm3, solid |
| Solubility in water | Slightly soluble |
| Melting point | 797 °C |
| Boiling point | 1155 °C |
| Acidity (pKa) | ? |
| Structure | |
| Coordination geometry |
octahedral |
| Crystal structure | ? |
| Thermodynamic data | |
| Standard enthalpy of formation ΔfH |
−745.17 kJ/mol |
| Standard molar entropy S |
77.78 J.K–1.mol–1 |
| Hazards | |
| MSDS | External MSDS |
| EU classification | Harmful (Xn) Irritant (Xi) |
| NFPA 704 | |
| R-phrases | R36/37, R48/20/22 |
| S-phrases | S2, S22, S25 |
| Flash point | non flammable |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | Molybdenum disulfide |
| Other cations | Chromium trioxide Molybdenum(IV) oxide Tungsten trioxide |
| Related compounds | Molybdic acid Sodium molybdate |
| 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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Molybdenum trioxide is an oxide of molybdenum, chemical formula MoO3. It starts to sublimate at temperatures above approximately 970 K (~700 °C).
It dissolves slightly in water to form molybdic acid.
As a mineral, it is known as molybdite.
Contents |
[edit] Material Safety Data Sheet
The handling of this chemical may incur notable safety precautions.
[edit] Structure and properties
| Structure and properties | |
|---|---|
| Index of refraction, nD | ? |
| Abbe number | ? |
| Dielectric constant, εr | ? ε0 at ? °C |
| Bond strength | ? |
| Bond length | ? |
| Bond angle | ? |
| Magnetic susceptibility | ? |
[edit] Thermodynamic properties
| Phase behavior | |
|---|---|
| Triple point | ? K (? °C), ? Pa |
| Critical point | ? K (? °C), ? Pa |
| Std enthalpy change of fusion, ΔfusH |
? kJ/mol |
| Std entropy change of fusion, ΔfusS |
? J/(mol·K) |
| Std enthalpy change of vaporization, ΔvapH |
? kJ/mol |
| Std entropy change of vaporization, ΔvapS |
? J/(mol·K) |
| Solid properties | |
| Std enthalpy change of formation, ΔfH |
−745.17 kJ/mol |
| Standard molar entropy, S |
77.78 J/(mol K) |
| Heat capacity, cp | ? J/(mol K) |
| Liquid properties | |
| Std enthalpy change of formation, ΔfH |
−703.73 kJ/mol |
| Standard molar entropy, S |
114.93 J/(mol K) |
| Heat capacity, cp | ? J/(mol K) |
| Gas properties | |
| Std enthalpy change of formation, ΔfH |
−346.44 kJ/mol |
| Standard molar entropy, S |
283.89 J/(mol K) |
| Heat capacity, cp | ? J/(mol K) |
[edit] Spectral data
| UV-Vis | |
|---|---|
| λmax | ? nm |
| Extinction coefficient, ε | ? |
| IR | |
| Major absorption bands | ? cm−1 |
| NMR | |
| Proton NMR | |
| Carbon-13 NMR | |
| Other NMR data | |
| MS | |
| Masses of main fragments |
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[edit] References
[edit] External links
- WebElements
- Greenwood, N. N.; A. Earnshaw (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
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