Formic acid
- Formula: CH2O2
- Molecular weight: 46.0254
- IUPAC Standard InChI: InChI=1S/CH2O2/c2-1-3/h1H,(H,2,3)
- IUPAC Standard InChIKey: BDAGIHXWWSANSR-UHFFFAOYSA-N
- CAS Registry Number: 64-18-6
- 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: Methanoic acid; Aminic acid; Bilorin; Collo-Bueglatt; Collo-Didax; Formisoton; Formylic acid; Hydrogen carboxylic acid; Myrmicyl; HCOOH; Acide formique; Acido formico; Ameisensaeure; Kwas metaniowy; Kyselina mravenci; Mierenzuur; Rcra waste number U123; UN 1779; Formira; Add-F; Amasil
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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
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -378.6 | kJ/mol | Cm | Guthrie, 1974 | Heat of hydrolysis; ALS |
| ΔfH°gas | -379.0 | kJ/mol | N/A | Lebedeva, 1964 | Value computed using ΔfHliquid° value of -425.5±0.3 kj/mol from Lebedeva, 1964 and ΔvapH° value of 46.5 kj/mol from Guthrie, 1974.; DRB |
| ΔfH°gas | -379.2 ± 0.6 | kJ/mol | Ccb | Lebedeva, 1964 | Value computed using ΔfHliquid° from Lebedeva, 1964 and ΔvapH° value of 46.3 kJ/mol from Konicek and Wadso, 1970.; DRB |
| ΔfH°gas | -378.3 | kJ/mol | N/A | Sinke, 1959 | Value computed using ΔfHliquid° value of -424.8±0.3 kj/mol from Sinke, 1959 and ΔvapH° value of 46.5 kj/mol from Guthrie, 1974.; DRB |
| ΔfH°gas | -378.5 ± 0.6 | kJ/mol | Ccb | Sinke, 1959 | Value computed using ΔfHliquid° from Sinke, 1959 and ΔvapH° value of 46.3 kJ/mol from Konicek and Wadso, 1970.; DRB |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas | 248.70 ± 0.42 | J/mol*K | N/A | Millikan R.C., 1957 | Other third-law S(298.15 K) value is 248.11(1.26) J/mol*K [ Halford J.O., 1942, Millikan R.C., 1957]. Please also see Waring W., 1952.; GT |
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 33.26 | 50. | Chao J., 1986 | p=1 bar. Selected entropies and heat capacities are in close agreement with statistically calculated values [ Fukushima K., 1971] and value of S(298.15 K) calculated by ab initio method [ East A.L.L., 1997]. Maximum discrepancies with other statistical calculations [ Waring W., 1952, Green J.H.S., 1961, Gurvich, Veyts, et al., 1989] amount to 1.1-3.9 J/mol*K for S(T) and 3.0-5.9 J/mol*K for Cp(T). Please also see Chao J., 1978.; GT |
| 33.44 | 100. | ||
| 34.91 | 150. | ||
| 37.83 | 200. | ||
| 43.54 | 273.15 | ||
| 45.68 ± 0.07 | 298.15 | ||
| 45.84 | 300. | ||
| 54.52 | 400. | ||
| 62.63 | 500. | ||
| 69.81 | 600. | ||
| 76.04 | 700. | ||
| 81.34 | 800. | ||
| 85.77 | 900. | ||
| 89.40 | 1000. | ||
| 92.33 | 1100. | ||
| 94.65 | 1200. | ||
| 96.48 | 1300. | ||
| 97.91 | 1400. | ||
| 99.02 | 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.
Guthrie, 1974
Guthrie, J.P.,
Hydration of carboxamides. Evaluation of the free energy change for addition of water to acetamide and formamide derivatives,
J. Am. Chem. Soc., 1974, 96, 3608-3615. [all data]
Lebedeva, 1964
Lebedeva, N.D.,
Heats of combustion of monocarboxylic acids,
Russ. J. Phys. Chem. (Engl. Transl.), 1964, 38, 1435-1437. [all data]
Konicek and Wadso, 1970
Konicek, J.; Wadso, I.,
Enthalpies of vaporization of organic compounds. VII. Some carboxylic acids,
Acta Chem. Scand., 1970, 24, 2612-26. [all data]
Sinke, 1959
Sinke, G.C.,
The heat of formation of formic acid,
J. Phys. Chem., 1959, 63, 2063. [all data]
Millikan R.C., 1957
Millikan R.C.,
Infrared spectra and vibrational assignment of monomeric formic acid,
J. Chem. Phys., 1957, 27, 1305-1308. [all data]
Halford J.O., 1942
Halford J.O.,
Entropy of the monomeric forms of formic acid and acetic acid,
J. Chem. Phys., 1942, 10, 582-584. [all data]
Waring W., 1952
Waring W.,
Some thermodynamic properties of formic acid,
Chem. Rev., 1952, 51, 171-183. [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]
Fukushima K., 1971
Fukushima K.,
Normal coordinate treatment and thermodynamic properties of the cis-trans isomers of formic acid and its deutero-analog,
J. Chem. Thermodyn., 1971, 3, 553-562. [all data]
East A.L.L., 1997
East A.L.L.,
Ab initio statistical thermodynamical models for the computation of third-law entropies,
J. Chem. Phys., 1997, 106, 6655-6674. [all data]
Green J.H.S., 1961
Green J.H.S.,
Thermodynamic properties of organic oxygen compounds. Part III. Formic acid,
J. Chem. Soc., 1961, 2241-2242. [all data]
Gurvich, Veyts, et al., 1989
Gurvich, L.V.; Veyts, I.V.; Alcock, C.B.,
Thermodynamic Properties of Individual Substances, 4th ed.; Vols. 1 and 2, Hemisphere, New York, 1989. [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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