Methylal
- Formula: C3H8O2
- Molecular weight: 76.0944
- IUPAC Standard InChI: InChI=1S/C3H8O2/c1-4-3-5-2/h3H2,1-2H3
- IUPAC Standard InChIKey: NKDDWNXOKDWJAK-UHFFFAOYSA-N
- CAS Registry Number: 109-87-5
- 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: Methane, dimethoxy-; Dimethyl formal; Anesthenyl; Dimethoxymethane; Formal; Formaldehyde dimethyl acetal; Methoxymethyl methyl ether; Methylene dimethyl ether; Methylene glycol dimethylether; (CH3O)2CH2; Methylenedioxydimethane; Metylal; UN 1234; Formaldehyde methyl ketal; 2,4-Dioxapentane; Dimethylacetal formaldehyde; Bis(methoxy)methane
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Gas phase thermochemistry data
Go To: Top, Condensed 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
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -83.21 ± 0.19 | kcal/mol | Cm | Pilcher and Fletcher, 1969 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°gas | -472.20 ± 0.18 | kcal/mol | Cm | Pilcher and Fletcher, 1969 | Corresponding ΔfHºgas = -83.21 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas | 80.24 ± 0.15 | cal/mol*K | N/A | McEachern D.M., 1964 | GT |
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 by: Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| S°liquid | 58.320 | cal/mol*K | N/A | McEachern and Kilpatrick, 1964 |
Constant pressure heat capacity of liquid
| Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 38.580 | 298.15 | McEachern and Kilpatrick, 1964 | T = 15 to 300 K. |
| 39.10 | 298. | von Reis, 1881 | T = 289 to 323 K. |
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.
Pilcher and Fletcher, 1969
Pilcher, G.; Fletcher, R.A.,
Measurements of heats of combustion by flame calorimetry. Part 5.-Dimethoxymethane, 1,1-Dimethoxyethane,
Trans. Faraday Soc., 1969, 65, 2326-2330. [all data]
McEachern D.M., 1964
McEachern D.M., Jr.,
Entropy and related thermodynamic properties of dimethoxymethane,
J. Chem. Phys., 1964, 41, 3127-3131. [all data]
McEachern and Kilpatrick, 1964
McEachern, D.M., Jr.; Kilpatrick, J.E.,
Entropy and related thermodynamic properties of dimethoxymethane,
J. Chem. Phys., 1964, 41, 3127-3131. [all data]
von Reis, 1881
von Reis, M.A.,
Die specifische Wärme flüssiger organischer Verbindungen und ihre Beziehung zu deren Moleculargewicht,
Ann. Physik [3], 1881, 13, 447-464. [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 S°gas Entropy of gas at standard conditions S°liquid Entropy of liquid at standard conditions ΔcH°gas Enthalpy of combustion 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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