boron
- Formula: B
- Molecular weight: 10.811
- IUPAC Standard InChI: InChI=1S/B
- IUPAC Standard InChIKey: ZOXJGFHDIHLPTG-UHFFFAOYSA-N
- CAS Registry Number: 7440-42-8
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry 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 | 565. ± 5. | kJ/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
| ΔfH°gas | 560.00 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1983 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 153.436 ± 0.015 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
| S°gas,1 bar | 153.44 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1983 |
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) | 4137.895 to 6000. |
|---|---|
| A | 20.65193 |
| B | 0.226427 |
| C | -0.112330 |
| D | 0.016889 |
| E | 0.008714 |
| F | 553.8654 |
| G | 178.4179 |
| H | 559.9991 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1983 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry 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°liquid | 48.93 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1983 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 26.54 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1983 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 5.90 ± 0.08 | J/mol*K | Review | Cox, Wagman, et al., 1984 | rhombic phase; CODATA Review value |
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) | 2350. to 4137.895 |
|---|---|
| A | 31.75003 |
| B | 2.556177×10-7 |
| C | -6.456792×10-8 |
| D | 5.616644×10-9 |
| E | 2.705970×10-7 |
| F | 27.94205 |
| G | 46.94741 |
| H | 48.92686 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1983 |
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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 298. to 1800. | 1800. to 2350. |
|---|---|---|
| A | 10.18574 | 25.12664 |
| B | 29.24415 | 1.975493 |
| C | -18.02137 | 0.338395 |
| D | 4.212326 | -0.040032 |
| E | -0.550999 | -2.635578 |
| F | -6.036299 | -14.43597 |
| G | 7.089077 | 25.59930 |
| H | 0.000000 | 0.000000 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | β-rhombohedral phase; Data last reviewed in June, 1983 | β-rhombohedral phase; Data last reviewed in June, 1983 |
References
Go To: Top, Gas phase thermochemistry data, 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.
Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A.,
CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]
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 thermochemistry data, Condensed phase thermochemistry data, References
- Symbols used in this document:
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,1 bar Entropy of solid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas 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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