tungsten trioxide
- Formula: O3W
- Molecular weight: 231.84
- IUPAC Standard InChI: InChI=1S/3O.W/q3*-2;+6
- IUPAC Standard InChIKey: UARSRGYYQSHHDK-UHFFFAOYSA-N
- CAS Registry Number: 1314-35-8
- Chemical structure:
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Condensed phase thermochemistry data
Go To: Top, 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°liquid | -188.55 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1966 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 24.739 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1966 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -201.46 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1966 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 18.14 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1966 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 1745. - 3000. |
|---|---|
| A | 31.50000 |
| B | 0.000000 |
| C | 0.000000 |
| D | 0.000000 |
| E | 0.000000 |
| F | -204.5720 |
| G | 50.63511 |
| H | -188.5550 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1966 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. - 1050. | 1050. - 1745. |
|---|---|---|
| A | 7.299140 | 16.32708 |
| B | 48.00837 | 8.395507 |
| C | -49.29446 | -2.474642 |
| D | 18.28855 | 0.482036 |
| E | -0.021248 | 0.536625 |
| F | -205.4422 | -204.8544 |
| G | 14.57177 | 37.37715 |
| H | -201.4601 | -201.4601 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in September, 1966 | Data last reviewed in September, 1966 |
References
Go To: Top, Condensed phase thermochemistry 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]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid 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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