Urea, tetraethyl-
- Formula: C9H20N2O
- Molecular weight: 172.2679
- IUPAC Standard InChI: InChI=1S/C9H20N2O/c1-5-10(6-2)9(12)11(7-3)8-4/h5-8H2,1-4H3
- IUPAC Standard InChIKey: UWHSPZZUAYSGTB-UHFFFAOYSA-N
- CAS Registry Number: 1187-03-7
- 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. - Other names: Tetraethylurea; 1,1,3,3-Tetraethylurea; Urea, 1,1,3,3-tetraethyl-; N,N,N',N'-Tetraethylurea
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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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -316.4 ± 5.0 | kJ/mol | Ccb | Kozyro, Simirskii, et al., 1990 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, 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
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -380.0 ± 5.0 | kJ/mol | Ccb | Kozyro, Simirskii, et al., 1990 | ALS |
| ΔfH°liquid | -554.0 ± 5.9 | kJ/mol | Ccb | Tavernier and Lamouroux, 1956 | Reanalyzed by Cox and Pilcher, 1970, Original value = -541.87 kJ/mol; Author's hf298_condensed=-134.219 kcal/mol; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°liquid | -6019.9 ± 4.8 | kJ/mol | Ccb | Kozyro, Simirskii, et al., 1990 | ALS |
| ΔcH°liquid | -5845.9 ± 5.9 | kJ/mol | Ccb | Tavernier and Lamouroux, 1956 | Reanalyzed by Cox and Pilcher, 1970, Original value = -5858.06 kJ/mol; Author's hf298_condensed=-134.219 kcal/mol; ALS |
Constant pressure heat capacity of liquid
| Cp,liquid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 355.6 | 298.15 | Kozyro, Simirskii, et al., 1990, 2 | T = 160 to 370 K. Cp(c) = 77.10 + 0.7804 T (160 to 230 K); Cp(liq) = 235.75 + 0.4019 T (290 to 370 K) J/mol*K.; DH |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Kozyro, Simirskii, et al., 1990
Kozyro, A.A.; Simirskii, V.V.; Kabo, G.Ya.; Frenkel, M.L.; Krasulin, A.P.; Sevruk, V.M.; Sokolov, N.A.,
The additivity of the thermodynamic properties of tetra-alkyl derivatives of carbamide,
Russ. J. Phys. Chem. (Engl. Transl.), 1990, 64, 1274-1275. [all data]
Tavernier and Lamouroux, 1956
Tavernier, P.; Lamouroux, M.,
Determinations calorimetriques relatives a vingt-six substances organiques,
Mem. Poudres, 1956, 38, 65-88. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]
Kozyro, Simirskii, et al., 1990, 2
Kozyro, A.A.; Simirskii, V.V.; Kabo, G.Ya.; Frenkel, M.L.; Krasulin, A.P.; Sevruk, V.M.; Sokolov, N.A.,
The additivity of the thermodynamic properties of tetra-alkyl derivatives of carbamide,
Zhur. Fiz. Khim., 1990, 64(9), 2360-2365. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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