diniobium pentaoxide
- Formula: Nb2O5
- Molecular weight: 265.8098
- CAS Registry Number: 1313-96-8
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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 | -437.588 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1972 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 40.994 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1972 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -454.001 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1972 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 32.815 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1972 |
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) | 1785. to 5000. |
|---|---|
| A | 57.90010 |
| B | 1.114836×10-7 |
| C | 8.084656×10-9 |
| D | -3.518882×10-9 |
| E | 3.895412×10-7 |
| F | -471.6730 |
| G | 83.33580 |
| H | -437.5884 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1972 |
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. to 1785. |
|---|---|
| A | 27.73829 |
| B | 28.00693 |
| C | -17.15182 |
| D | 3.658796 |
| E | -0.277459 |
| F | -464.3021 |
| G | 57.20220 |
| H | -454.0010 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1972 |
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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