iron
- Formula: Fe
- Molecular weight: 55.845
- IUPAC Standard InChI: InChI=1S/Fe
- IUPAC Standard InChIKey: XEEYBQQBJWHFJM-UHFFFAOYSA-N
- CAS Registry Number: 7439-89-6
- Chemical structure:
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- 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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Gas Phase Heat Capacity (Shomate Equation)
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.
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) | 3133.345 to 6000. |
|---|---|
| A | 2.698980 |
| B | 1.670581 |
| C | -0.265369 |
| D | 0.029243 |
| E | 1.359771 |
| F | 101.2280 |
| G | 49.32101 |
| H | 99.30010 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1978 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 3133. | 6.37 | 56.57 | 51.42 | 16.14 |
| 3200. | 6.42 | 56.70 | 51.53 | 16.56 |
| 3300. | 6.50 | 56.90 | 51.69 | 17.21 |
| 3400. | 6.58 | 57.09 | 51.84 | 17.86 |
| 3500. | 6.66 | 57.29 | 51.99 | 18.52 |
| 3600. | 6.74 | 57.48 | 52.14 | 19.19 |
| 3700. | 6.83 | 57.66 | 52.29 | 19.87 |
| 3800. | 6.91 | 57.84 | 52.43 | 20.56 |
| 3900. | 7.00 | 58.02 | 52.58 | 21.25 |
| 4000. | 7.09 | 58.20 | 52.71 | 21.96 |
| 4100. | 7.18 | 58.38 | 52.85 | 22.67 |
| 4200. | 7.28 | 58.55 | 52.98 | 23.40 |
| 4300. | 7.37 | 58.73 | 53.11 | 24.13 |
| 4400. | 7.47 | 58.90 | 53.24 | 24.87 |
| 4500. | 7.57 | 59.07 | 53.37 | 25.62 |
| 4600. | 7.68 | 59.23 | 53.50 | 26.39 |
| 4700. | 7.79 | 59.40 | 53.62 | 27.16 |
| 4800. | 7.90 | 59.56 | 53.74 | 27.94 |
| 4900. | 8.01 | 59.73 | 53.86 | 28.74 |
| 5000. | 8.13 | 59.89 | 53.98 | 29.55 |
| 5100. | 8.25 | 60.05 | 54.10 | 30.36 |
| 5200. | 8.37 | 60.22 | 54.22 | 31.20 |
| 5300. | 8.50 | 60.38 | 54.33 | 32.04 |
| 5400. | 8.63 | 60.54 | 54.44 | 32.90 |
| 5500. | 8.77 | 60.70 | 54.56 | 33.77 |
| 5600. | 8.91 | 60.86 | 54.67 | 34.65 |
| 5700. | 9.06 | 61.01 | 54.78 | 35.55 |
| 5800. | 9.21 | 61.17 | 54.89 | 36.46 |
| 5900. | 9.36 | 61.33 | 54.99 | 37.39 |
| 6000. | 9.52 | 61.49 | 55.10 | 38.33 |
References
Go To: Top, Gas Phase Heat Capacity (Shomate Equation), 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, Gas Phase Heat Capacity (Shomate Equation), References
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