Phosphorus dimer
- Formula: P2
- Molecular weight: 61.947524
- IUPAC Standard InChI: InChI=1S/P2/c1-2
- IUPAC Standard InChIKey: FOBPTJZYDGNHLR-UHFFFAOYSA-N
- CAS Registry Number: 12185-09-0
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Reaction 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 | 34.42 ± 0.48 | kcal/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
| ΔfH°gas | 34.333 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1961 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 52.1326 ± 0.001 | cal/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
| S°gas,1 bar | 52.120 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1961 |
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) | 298. to 6000. |
|---|---|
| A | 8.585560 |
| B | 0.354638 |
| C | -0.081217 |
| D | 0.006912 |
| E | -0.096061 |
| F | 31.43480 |
| G | 61.86800 |
| H | 34.33389 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1961 |
Reaction 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.
Data compiled by: John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
(CAS Reg. No. 141171-05-3 • 4294967295) +
= CAS Reg. No. 141171-05-3
By formula: (CAS Reg. No. 141171-05-3 • 4294967295P2) + P2 = CAS Reg. No. 141171-05-3
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 49.6 ± 7.7 | kcal/mol | Ther | O'Hair, Krempp, et al., 1992 | gas phase; Acidity between MeNO2, tBuSH |
| ΔrH° | 51.0 ± 5.0 | kcal/mol | IMRB | O'Hair, Krempp, et al., 1992 | gas phase; Hydride affinity: between CO2, SO2 |
(CAS Reg. No. 141171-04-2 • 4294967295) +
= CAS Reg. No. 141171-04-2
By formula: (CAS Reg. No. 141171-04-2 • 4294967295P2) + P2 = CAS Reg. No. 141171-04-2
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 34.4 ± 2.5 | kcal/mol | IMRB | O'Hair, Krempp, et al., 1992 | gas phase; Fluoride affinity: Between H2S, MeSH |
| ΔrH° | 33.0 ± 8.1 | kcal/mol | Ther | O'Hair, Krempp, et al., 1992 | gas phase; Acidity between MeSH, H2S |
References
Go To: Top, Gas phase thermochemistry data, Reaction 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]
O'Hair, Krempp, et al., 1992
O'Hair, R.A.J.; Krempp, M.; Damrauer, R.; Depuy, C.H.,
Gas-Phase Ion Chemistry of HP2(-), FP2(-), and HP2(+),
Inorg. Chem., 1992, 31, 11, 2092, https://doi.org/10.1021/ic00037a021
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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