Ethyne, difluoro-
- Formula: C2F2
- Molecular weight: 62.0182
- IUPAC Standard InChI: InChI=1S/C2F2/c3-1-2-4
- IUPAC Standard InChIKey: BWTZYYGAOGUPFQ-UHFFFAOYSA-N
- CAS Registry Number: 689-99-6
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Acetylene, difluoro-; Difluoroacetylene; FC≡CF; Difluoroethyne; C2F2
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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.
Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 20.92 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1967 |
| ΔfH°gas | -190. ± 30. | kJ/mol | Eqk | Ehlert, 1969 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 244.06 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1967 |
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. to 1200. | 1200. to 6000. |
|---|---|---|
| A | 38.31795 | 85.46531 |
| B | 89.70831 | 0.982972 |
| C | -65.98963 | -0.192525 |
| D | 17.89903 | 0.013000 |
| E | -0.244157 | -6.812054 |
| F | 5.236527 | -21.55835 |
| G | 265.0840 | 323.6060 |
| H | 20.92004 | 20.92004 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1967 | Data last reviewed in December, 1967 |
References
Go To: Top, Gas phase thermochemistry data, 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]
Ehlert, 1969
Ehlert, T.C.,
Bonding in C1 and C2 fluroides,
J. Phys. Chem., 1969, 73, 949-953. [all data]
Notes
Go To: Top, Gas phase 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 - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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