Methylene, difluoro-
- Formula: CF2
- Molecular weight: 50.0075
- IUPAC Standard InChI: InChI=1S/CF2/c2-1-3
- IUPAC Standard InChIKey: LTVOKYUPTHZZQH-UHFFFAOYSA-N
- CAS Registry Number: 2154-59-8
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Calcium difluoride; Difluoromethylene
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Gas phase thermochemistry data
Go To: Top, 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 | -43.499 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1970 |
| ΔfH°gas | -41.1 ± 2.0 | kcal/mol | Eqk | Ehlert, 1969 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 57.560 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1970 |
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 600. | 600. to 6000. |
|---|---|---|
| A | 2.109410 | 14.18440 |
| B | 29.96300 | -0.553818 |
| C | -30.94981 | 0.212839 |
| D | 12.02940 | -0.013355 |
| E | 0.062082 | -0.828763 |
| F | -45.00280 | -50.09931 |
| G | 52.79830 | 71.28511 |
| H | -43.50000 | -43.50000 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1970 | Data last reviewed in June, 1970 |
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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