Ethynyl radical
- Formula: C2H
- Molecular weight: 25.0293
- IUPAC Standard InChI: InChI=1S/C2H/c1-2/h1H
- IUPAC Standard InChIKey: XEHVFKKSDRMODV-UHFFFAOYSA-N
- CAS Registry Number: 2122-48-7
- Chemical structure:
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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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 476.98 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1967 |
| ΔfH°gas | 556. ± 8. | kJ/mol | N/A | Tsang, 1996 | |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 207.44 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 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 | 33.40916 | 39.29220 |
| B | 24.11331 | 13.32081 |
| C | -6.600595 | -1.952364 |
| D | 0.278912 | 0.086290 |
| E | -0.259459 | 0.978203 |
| F | 465.1311 | 464.3027 |
| G | 239.5148 | 248.5949 |
| H | 476.9760 | 476.9760 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in March, 1967 | Data last reviewed in March, 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]
Tsang, 1996
Tsang, W.,
Heats of Formation of Organic Free Radicals by Kinetic Methods
in Energetics of Organic Free Radicals, Martinho Simoes, J.A.; Greenberg, A.; Liebman, J.F., eds., Blackie Academic and Professional, London, 1996, 22-58. [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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