tantalum
- Formula: Ta
- Molecular weight: 180.94788
- IUPAC Standard InChI: InChI=1S/Ta
- IUPAC Standard InChIKey: GUVRBAGPIYLISA-UHFFFAOYSA-N
- CAS Registry Number: 7440-25-7
- Chemical structure:
This structure is also available as a 2d Mol file - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Data at other public NIST sites:
- NIST Atomic Spectra Database - Lines Holdings (on physics web site)
- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
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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 | 7.361 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1972 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 12.04 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1972 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 9.914 | 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) | 3258. to 5778.07 |
|---|---|
| A | 10.00000 |
| B | 5.843191×10-9 |
| C | -1.155071×10-9 |
| D | 7.821650×10-11 |
| E | 1.253040×10-8 |
| F | -1.477771 |
| G | 17.46230 |
| H | 7.360189 |
| 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 1300. | 1300. to 3258. |
|---|---|---|
| A | 4.946181 | -10.48550 |
| B | 4.134781 | 17.45240 |
| C | -3.749969 | -6.550660 |
| D | 1.340511 | 0.957142 |
| E | 0.014718 | 6.286841 |
| F | -1.578261 | 14.38220 |
| G | 14.90330 | 6.144821 |
| H | 0.000000 | 0.000000 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1972 | 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 - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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