Methyl peroxide

Formula: CH₄O₂
Molecular weight: 48.0413
IUPAC Standard InChI: InChI=1S/CH4O2/c1-3-2/h2H,1H3
IUPAC Standard InChIKey: MEUKEBNAABNAEX-UHFFFAOYSA-N
CAS Registry Number: 3031-73-0
Chemical structure:
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Gas phase thermochemistry data

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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	-131.0	kJ/mol	Eqk	Khursan and Martem'yanov, 1991	hf from V. P.Komissarov's report; ALS

Constant pressure heat capacity of gas

C_p,gas (J/mol*K)	Temperature (K)	Reference	Comment
35.82	50.	Dorofeeva O.V., 1997	p=1 bar.; GT
43.12	100.
48.61	150.
53.14	200.
63. ± 3.	298.15
62.88	300.
73.65	400.
83.78	500.
92.60	600.
100.17	700.
106.70	800.
112.36	900.
117.29	1000.
121.58	1100.
125.33	1200.
128.61	1300.
131.47	1400.
133.98	1500.

Phase change data

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Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos

Quantity	Value	Units	Method	Reference	Comment
Δ_vapH°	35.	kJ/mol	V	Blat, Gerber, et al., 1939	ALS

Enthalpy of vaporization

Δ_vapH (kJ/mol)	Temperature (K)	Method	Reference	Comment
37.7	268.	A	Stephenson and Malanowski, 1987	Based on data from 253. to 313. K. See also Egerton, Emte, et al., 1951.; AC

References

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Khursan and Martem'yanov, 1991
Khursan, S.L.; Martem'yanov, V.S., Thermochemistry of the recombination of peroxyl radicals, Russ. J. Phys. Chem. (Engl. Transl.), 1991, 65, 321-325. [all data]

Dorofeeva O.V., 1997
Dorofeeva O.V., Unpublished results. Thermocenter of Russian Academy of Science, Moscow, 1997. [all data]

Blat, Gerber, et al., 1939
Blat, E.J.; Gerber, M.J.; Neumann, M.B., The influence of organic peroxides on the cool flame of butane, Acta Physicochim. U.R.S.S., 1939, 10, 273-296. [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Egerton, Emte, et al., 1951
Egerton, A.C.; Emte, W.; Minkoff, G.J., Some properties of organic peroxides, Faraday Discuss. Chem. Soc., 1951, 10, 278. [all data]

Notes

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Symbols used in this document:

C_p,gas Constant pressure heat capacity of gas

Δ_fH°_gas Enthalpy of formation of gas at standard conditions

Δ_vapH Enthalpy of vaporization

Δ_vapH° Enthalpy of vaporization 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_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_vapH	Enthalpy of vaporization
Δ_vapH°	Enthalpy of vaporization at standard conditions