molybdenum trioxide
- Formula: MoO3
- Molecular weight: 143.96
- CAS Registry Number: 1313-27-5
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -346.44 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 283.89 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1978 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 2000. to 6000. |
|---|---|
| A | 82.73567 |
| B | 0.228318 |
| C | -0.046180 |
| D | 0.003197 |
| E | -3.741405 |
| F | -381.7624 |
| G | 367.8368 |
| H | -346.4352 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1978 |
Condensed phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -703.73 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 114.93 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -745.17 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 77.78 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1978 |
Liquid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 1074. to 2000. |
|---|---|
| A | 126.9513 |
| B | -0.000001 |
| C | 7.382584×10-7 |
| D | -1.462463×10-7 |
| E | -1.099012×10-7 |
| F | -759.0948 |
| G | 231.3129 |
| H | -703.7279 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1978 |
Solid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1074. |
|---|---|
| A | 93.31366 |
| B | -22.81113 |
| C | 52.63054 |
| D | -12.74279 |
| E | -1.416934 |
| F | -777.1654 |
| G | 187.3106 |
| H | -745.1704 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1978 |
Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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| Temperature (K) | A | B | C | Reference | Comment |
|---|---|---|---|---|---|
| 1007. to 1424. | 2.6317 | 2137.407 | -616.484 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Gas phase ion energetics data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 3.170 ± 0.020 | LPES | Yoder, Maze, et al., 2005 | B |
| 2.85 ± 0.21 | R-A | Rudnyi, Vovk, et al., 1989 | Multi-parameter fit to many IMRE, Ion-ion Eq. ΔHf(A-) at 0 K; value altered from reference due to conversion from electron convention to ion convention; B |
| 3.10 ± 0.45 | R-A | Miller, 1979 | H + HMoO4- <=> H2O + MoO3-; B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 11.8 ± 0.5 | EI | Yamdagni, Pupp, et al., 1970 | RDSH |
| 12.2 ± 0.5 | EI | Pupp, Yamdagni, et al., 1969 | RDSH |
| 11.8 | EI | Drowart, Exsteen, et al., 1964 | RDSH |
| 12.0 ± 0.6 | EI | DeMaria, Burns, et al., 1960 | RDSH |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
Yoder, Maze, et al., 2005
Yoder, B.L.; Maze, J.T.; Raghavachari, K.; Jarrold, C.C.,
Structures of Mo2Oy- and Mo2Oy (y=2, 3, and 4) studied by anion photoelectron spectroscopy and density functional theory calculations,
J. Chem. Phys., 2005, 122, 9, 094313, https://doi.org/10.1063/1.1853379
. [all data]
Rudnyi, Vovk, et al., 1989
Rudnyi, E.B.; Vovk, O.M.; Kaibicheva, E.A.; Sidorov, L.N.,
Formation Enthalpies of Oxygen Containing Anions of Group VI Elements in the Gas Phase and the Electron Affinities of CrO3, MoO3, and WO3,
J. Chem. Thermodyn., 1989, 21, 3, 247, https://doi.org/10.1016/0021-9614(89)90014-1
. [all data]
Miller, 1979
Miller, W.J.,
The use of flames as media for the study of in-molecule thermochemistry in characterization of high temperature vapors and gases,
NBS Spec. Publ. U.S., 1979, 561, 443. [all data]
Yamdagni, Pupp, et al., 1970
Yamdagni, R.; Pupp, C.; Porter, R.F.,
Mass spectrometric study of the evaporation of lithium and sodium molybdates and tungstates,
J. Inorg. Nucl. Chem., 1970, 32, 3509. [all data]
Pupp, Yamdagni, et al., 1969
Pupp, C.; Yamdagni, R.; Porter, R.F.,
Mass spectrometric study of the evaporation of BaMoO4 and BaWO4,
J. Inorg. Nucl. Chem., 1969, 31, 2021. [all data]
Drowart, Exsteen, et al., 1964
Drowart, J.; Exsteen, G.; Verhaegen, G.,
Mass spectrometric determination of the dissociation energy of the molecules MgO, CaO, SrO and Sr2O,
J. Chem. Soc. Faraday Trans., 1964, 60, 1920. [all data]
DeMaria, Burns, et al., 1960
DeMaria, G.; Burns, R.P.; Drowart, J.; Inghram, M.G.,
Mass spectrometric study of gaseous molybdenum, tungsten, and uranium oxides,
J. Chem. Phys., 1960, 32, 1373. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, References
- Symbols used in this document:
EA Electron affinity S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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