niobium pentabromide
- Formula: Br5Nb
- Molecular weight: 492.426
- IUPAC Standard InChI: InChI=1S/5BrH.Nb/h5*1H;/p-1
- IUPAC Standard InChIKey: ITWCCCHTECIZSS-UHFFFAOYSA-M
- CAS Registry Number: 13478-45-0
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Niobium(V) pentabromide
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Gas phase thermochemistry data
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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 | -106.02 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1974 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 107.37 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1974 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 900. - 6000. |
|---|---|
| A | 31.72251 |
| B | 0.063464 |
| C | -0.017499 |
| D | 0.001512 |
| E | -0.149889 |
| F | -115.9842 |
| G | 144.9008 |
| H | -106.0201 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1974 |
Condensed phase thermochemistry data
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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 | -130.27 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1974 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 65.488 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1974 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -132.90 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1974 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 61.850 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1974 |
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) | 527. - 900. |
|---|---|
| A | 47.26960 |
| B | 38.75956 |
| C | -76.69599 |
| D | 26.59895 |
| E | 0.243236 |
| F | -145.6702 |
| G | 112.5258 |
| H | -130.2758 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1974 |
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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 298. - 527. |
|---|---|
| A | 35.35014 |
| B | -0.001209 |
| C | 0.002054 |
| D | -0.001214 |
| E | -0.000005 |
| F | -143.4398 |
| G | 104.6298 |
| H | -132.9001 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1974 |
Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 27.5 ± 4.3 | kcal/mol | N/A | Türler, Eichler, et al., 1996 | Based on data from 298. - 479. K. |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, NIST Free Links, 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]
Türler, Eichler, et al., 1996
Türler, A.; Eichler, B.; Jost, D.T.; Piguet, D.; Gäggeler, H.W.; Gregorich, K.E.; Kadkhodayan, B.; Kreek, S.A.; Lee, D.M.; Mohar, M.; Sylwester, E.; Hoffman, D.C.; Hübener, S.,
On-line Gas Phase Chromatography with Chlorides of Niobium and Hahnium (Element 105),
Radiochimca Acta, 1996, 73, 2, 55-66, https://doi.org/10.1524/ract.1996.73.2.55
. [all data]
Notes
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- 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 Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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