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
Go To: Top, Mass spectrum (electron ionization), References, Notes
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 |
Mass spectrum (electron ionization)
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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
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Due to licensing restrictions, this spectrum cannot be downloaded.
| Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
|---|---|
| Origin | HCACAV,61(1)357(1978); G. BIERI ET AL |
| NIST MS number | 65540 |
References
Go To: Top, Gas phase thermochemistry data, Mass spectrum (electron ionization), 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, Mass spectrum (electron ionization), 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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