Hydrogen fluoride dimer
- Formula: F2H2
- Molecular weight: 40.01269
- CAS Registry Number: 30664-12-1
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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 | -572.66 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1977 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 238.84 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1977 |
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) | 298. - 1500. | 1500. - 6000. |
|---|---|---|
| A | 35.58910 | 68.32974 |
| B | 50.55234 | 6.950001 |
| C | -28.01142 | -1.229352 |
| D | 6.708458 | 0.076663 |
| E | -0.313996 | -12.36493 |
| F | -586.3416 | -616.1693 |
| G | 266.2555 | 293.0398 |
| H | -572.6641 | -572.6641 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1977 | Data last reviewed in June, 1977 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, NIST Free Links, 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: Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| H2F+ | 15.65 ± 0.04 | F | PI | Tiedemann, Anderson, et al., 1979 | |
| H2F+ | 15.65 ± 0.06 | F | PI | Ng, Trevor, et al., 1977 |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]
Tiedemann, Anderson, et al., 1979
Tiedemann, P.W.; Anderson, S.L.; Ceyer, S.T.; Hirooka, T.; Ng, C.Y.; Mahan, B.H.; Lee, Y.T.,
Proton affinities of hydrogen halides determined by the molecular beam photoionization method,
J. Chem. Phys., 1979, 71, 605. [all data]
Ng, Trevor, et al., 1977
Ng, C.Y.; Trevor, D.J.; Tiedemann, P.W.; Ceyer, S.T.; Kronebusch, P.L.; Mahan, B.H.; Lee, Y.T.,
Photoionization of dimeric polyatomic molecules: proton affinities of H2O and HF,
J. Chem. Phys., 1977, 67, 4235. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, NIST Free Links, References
- Symbols used in this document:
AE Appearance energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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