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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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	-50.66 ± 0.19	kcal/mol	Cm	Fletcher and Pilcher, 1970	ALS
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_gas	-205.76 ± 0.18	kcal/mol	Cm	Fletcher and Pilcher, 1970	Corresponding Δ_fHº_gas = -50.66 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
8.690	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
9.900	100.
10.98	150.
12.07	200.
13.77	273.15
14.40	298.15
14.44	300.
17.02	400.
19.46	500.
21.54	600.
23.20	700.
24.484	800.
25.480	900.
26.257	1000.
26.874	1100.
27.371	1200.
27.777	1300.
28.114	1400.
28.39	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