Glyoxal

Formula: C₂H₂O₂
Molecular weight: 58.0361
IUPAC Standard InChI: InChI=1S/C2H2O2/c3-1-2-4/h1-2H
IUPAC Standard InChIKey: LEQAOMBKQFMDFZ-UHFFFAOYSA-N
CAS Registry Number: 107-22-2
Chemical structure:
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Other names: Ethanedial; Biformal; Biformyl; Diformyl; Ethanedione; Glyoxal aldehyde; Glyoxylaldehyde; Oxal; Oxalaldehyde; 1,2-Ethanedione; (CHO)2; Diformal; Ethane-1,2-dione; Ethandial; Aerotex glyoxal 40; ODIX; Protectol GL 40
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- Computational Chemistry Comparison and Benchmark Database
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Gas phase thermochemistry data

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
Δ_fH°_gas	-212.0 ± 0.79	kJ/mol	Cm	Fletcher and Pilcher, 1970	ALS
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_gas	-860.90 ± 0.75	kJ/mol	Cm	Fletcher and Pilcher, 1970	Corresponding Δ_fHº_gas = -212.0 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS

Constant pressure heat capacity of gas

C_p,gas (J/mol*K)	Temperature (K)	Reference	Comment
36.36	50.	Thermodynamics Research Center, 1997	p=1 bar. Recommended entropies and heat capacities are in close agreement with other statistically calculated values [ Compton D.A.C., 1977, Hollenstein H., 1980]. Calculation [ Natarajan A., 1982] seems to be erroneous.; GT
41.42	100.
45.95	150.
50.49	200.
57.63	273.15
60.23	298.15
60.43	300.
71.21	400.
81.43	500.
90.12	600.
97.05	700.
102.44	800.
106.61	900.
109.86	1000.
112.44	1100.
114.52	1200.
116.22	1300.
117.63	1400.
118.8	1500.

References

Go To: Top, Gas phase thermochemistry data, Notes

Fletcher and Pilcher, 1970
Fletcher, R.A.; Pilcher, G., Measurements of heats of combustion by flame calorimetry, Trans. Faraday Soc., 1970, 66, 794-799. [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]

Compton D.A.C., 1977
Compton D.A.C., Values for the gas-phase thermodynamic functions of conjugated compounds existing as a mixture of conformers, J. Chem. Soc. Perkin Trans. 2, 1977, 1307-1311. [all data]

Hollenstein H., 1980
Hollenstein H., Sum of states, isomeric group and symmetry number of nonrigid molecules, Chem. Phys., 1980, 47, 269-285. [all data]

Natarajan A., 1982
Natarajan A., Vibrational analysis of glyoxal-h2, -d2 and -hd, J. Indian Chem. Soc., 1982, 59, 1156-1157. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, References

Symbols used in this document:

C_p,gas Constant pressure heat capacity of gas

Δ_cH°_gas Enthalpy of combustion of gas at standard conditions

Δ_fH°_gas Enthalpy of formation of gas at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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C_p,gas	Constant pressure heat capacity of gas
Δ_cH°_gas	Enthalpy of combustion of gas at standard conditions
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions