2-Butyne
- Formula: C4H6
- Molecular weight: 54.0904
- IUPAC Standard InChI: InChI=1S/C4H6/c1-3-4-2/h1-2H3
- IUPAC Standard InChIKey: XNMQEEKYCVKGBD-UHFFFAOYSA-N
- CAS Registry Number: 503-17-3
- 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: But-2-yne; Dimethylacetylene; CH3C≡CCH3; Crotonylene; UN 1144
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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
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 145.1 ± 1.0 | kJ/mol | Cm | Prosen, Maron, et al., 1951 | ALS |
| ΔfH°gas | 148.0 ± 1.5 | kJ/mol | Ccb | Wagman, Kilpatrick, et al., 1945 | Unpublished work of E. J. Prosen; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°gas | -2576.7 ± 0.96 | kJ/mol | Cm | Prosen, Maron, et al., 1951 | Corresponding ΔfHºgas = 145.1 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 39.18 | 50. | Thermodynamics Research Center, 1997 | p=1 bar. Selected values are in close agreement with other statistically calculated values [ Wagman D.D., 1945].; GT |
| 48.43 | 100. | ||
| 56.69 | 150. | ||
| 63.57 | 200. | ||
| 74.10 | 273.15 | ||
| 78.02 | 298.15 | ||
| 78.32 | 300. | ||
| 94.73 | 400. | ||
| 110.38 | 500. | ||
| 124.30 | 600. | ||
| 136.49 | 700. | ||
| 147.14 | 800. | ||
| 156.45 | 900. | ||
| 164.55 | 1000. | ||
| 171.59 | 1100. | ||
| 177.71 | 1200. | ||
| 183.0 | 1300. | ||
| 187.6 | 1400. | ||
| 191.7 | 1500. |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 84.56 | 336.07 | Kistiakowsky G.B., 1940 | GT |
| 89.66 | 369.46 |
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.
Prosen, Maron, et al., 1951
Prosen, E.J.; Maron, F.W.; Rossini, F.D.,
Heats of combustion, formation, and insomerization of ten C4 hydrocarbons,
J. Res. NBS, 1951, 46, 106-112. [all data]
Wagman, Kilpatrick, et al., 1945
Wagman, D.D.; Kilpatrick, J.E.; Pitzer, K.S.; Rossini, F.D.,
Heats, equilibrium constants, and free energies of formation of the acetylene hydrocarbons through the pentynes, to 1,500° K,
J. Res. NBS, 1945, 35, 467-496. [all data]
Thermodynamics Research Center, 1997
Thermodynamics Research Center,
Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [all data]
Wagman D.D., 1945
Wagman D.D.,
Heats, equilibrium constants, and free energies of formation of the acetylene hydrocarbons through the pentynes to 1500 K,
J. Res. Nat. Bur. Stand., 1945, 35, 467-496. [all data]
Kistiakowsky G.B., 1940
Kistiakowsky G.B.,
Gaseous heat capacities. III,
J. Chem. Phys., 1940, 8, 618-622. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas ΔcH°gas Enthalpy of combustion of gas at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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