Acetic acid
- Formula: C2H4O2
- Molecular weight: 60.0520
- IUPAC Standard InChI: InChI=1S/C2H4O2/c1-2(3)4/h1H3,(H,3,4)
- IUPAC Standard InChIKey: QTBSBXVTEAMEQO-UHFFFAOYSA-N
- CAS Registry Number: 64-19-7
- 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. - Isotopologues:
- Other names: Ethanoic acid; Ethylic acid; Glacial acetic acid; Methanecarboxylic acid; Vinegar acid; CH3COOH; Acetasol; Acide acetique; Acido acetico; Azijnzuur; Essigsaeure; Octowy kwas; Acetic acid, glacial; Kyselina octova; UN 2789; Aci-jel; Shotgun; Ethanoic acid monomer; NSC 132953
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- Information on this page:
- Other data available:
- Condensed phase thermochemistry data
- Phase change data
- Reaction thermochemistry data: reactions 1 to 50, reactions 51 to 79
- Henry's Law data
- Gas phase ion energetics data
- Ion clustering data
- IR Spectrum
- Mass spectrum (electron ionization)
- UV/Visible spectrum
- Vibrational and/or electronic energy levels
- Gas Chromatography
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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:
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -433. ± 3. | kJ/mol | AVG | N/A | Average of 8 values; Individual data points |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas | 282.84 | J/mol*K | N/A | Weltner W., 1955 | Other third-law entropy values at 298.15 K are 284.5 [ Chao J., 1986] and 290.37(4.18) J/mol*K [ Halford J.O., 1941].; GT |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 39.54 | 50. | Chao J., 1986 | p=1 bar. Selected entropies and heat capacities differ from other statistically calculated values [ Weltner W., 1955] by 1.0-1.3 J/mol*K for S(T) and 3.1-5.4 J/mol*K for Cp(T). Please also see Chao J., 1978.; GT |
| 40.42 | 100. | ||
| 42.74 | 150. | ||
| 48.34 | 200. | ||
| 59.38 | 273.15 | ||
| 63.44 ± 0.11 | 298.15 | ||
| 63.74 | 300. | ||
| 79.66 | 400. | ||
| 93.93 | 500. | ||
| 106.18 | 600. | ||
| 116.63 | 700. | ||
| 125.50 | 800. | ||
| 132.99 | 900. | ||
| 139.26 | 1000. | ||
| 144.46 | 1100. | ||
| 148.76 | 1200. | ||
| 152.30 | 1300. | ||
| 155.22 | 1400. | ||
| 157.63 | 1500. |
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.
Weltner W., 1955
Weltner W., Jr.,
The vibrational spectrum, associative and thermodynamic properties of acetic acid vapor,
J. Am. Chem. Soc., 1955, 77, 3941-3950. [all data]
Chao J., 1986
Chao J.,
Thermodynamic properties of key organic oxygen compounds in the carbon range C1 to C4. Part 2. Ideal gas properties,
J. Phys. Chem. Ref. Data, 1986, 15, 1369-1436. [all data]
Halford J.O., 1941
Halford J.O.,
The entropy of acetic acid,
J. Chem. Phys., 1941, 9, 859-863. [all data]
Chao J., 1978
Chao J.,
Ideal gas thermodynamic properties of methanoic and ethanoic acids,
J. Phys. Chem. Ref. Data, 1978, 7, 363-377. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas S°gas Entropy 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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