Methanethiol
- Formula: CH4S
- Molecular weight: 48.107
- IUPAC Standard InChIKey: LSDPWZHWYPCBBB-UHFFFAOYSA-N
- CAS Registry Number: 74-93-1
- 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: Methyl mercaptan; Mercaptomethane; CH3SH; Methyl sulfhydrate; Methyl thioalcohol; Mercaptan methylique; Methaanthiol; Methanthiol; Methvtiolo; Methylmercaptaan; Metilmercaptano; Rcra waste number U153; Thiomethanol; UN 1064; Methanethiole
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Condensed phase thermochemistry data
Go To: Top, Phase change 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 | -11.15 ± 0.13 | kcal/mol | Ccr | Good, Lacina, et al., 1961 | ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -363.47 ± 0.12 | kcal/mol | Ccr | Good, Lacina, et al., 1961 | Reanalyzed by Cox and Pilcher, 1970, Original value = -363.0 ± 0.12 kcal/mol; ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid | 39.011 | cal/mol*K | N/A | Russell, Osborne, et al., 1942 | DH |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
21.28 | 280. | Russell, Osborne, et al., 1942 | T = 15 to 280 K.; DH |
Phase change 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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
DH - Eugene S. Domalski and Elizabeth D. Hearing
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 279.1 ± 0.5 | K | AVG | N/A | Average of 6 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 150.18 | K | N/A | Morris, Lanum, et al., 1960 | Uncertainty assigned by TRC = 0.02 K; TRC |
Tfus | 150.1 | K | N/A | Teets, 1934 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 150.1 | K | N/A | Ellis and Reid, 1932 | Uncertainty assigned by TRC = 0.4 K; TRC |
Tfus | 152.15 | K | N/A | Timmermans and Mattaar, 1921 | Uncertainty assigned by TRC = 0.6 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 150.14 | K | N/A | Russell, Osborne, et al., 1942, 2 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.05 K; TRC |
Ttriple | 150.16 | K | N/A | Russell, Osborne, et al., 1942, 2 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.03 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 469.9 | K | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.4 K; by disappearance of meniscus turbidity; TRC |
Tc | 469.9 | K | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.4 K; by appearance of turbidity; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 71.35 | atm | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.5000 atm; vapor pressure at Tc; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 6.891 | mol/l | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.04 mol/l; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 5.69 | kcal/mol | N/A | Reid, 1972 | AC |
ΔvapH° | 5.69 ± 0.02 | kcal/mol | V | Good, Lacina, et al., 1961 | ALS |
ΔvapH° | 5.71 | kcal/mol | N/A | Good, Lacina, et al., 1961 | DRB |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
5.8719 | 279.12 | N/A | Russell, Osborne, et al., 1942 | P = 101.325 kPa; DH |
6.50 | 223. | N/A | Dykyj, Svoboda, et al., 1999 | Based on data from 208. to 298. K.; AC |
6.02 | 359. | A | Stephenson and Malanowski, 1987 | Based on data from 267. to 359. K.; AC |
6.14 | 268. | A | Stephenson and Malanowski, 1987 | Based on data from 221. to 283. K.; AC |
5.66 | 360. | A | Stephenson and Malanowski, 1987 | Based on data from 345. to 424. K.; AC |
5.78 | 429. | A | Stephenson and Malanowski, 1987 | Based on data from 414. to 470. K.; AC |
6.17 | 264. | N/A | Stephenson and Malanowski, 1987 | Based on data from 222. to 279. K. See also Russell, Osborne, et al., 1942.; AC |
Entropy of vaporization
ΔvapS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
21.04 | 279.12 | Russell, Osborne, et al., 1942 | P; DH |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
279.9 to 458. | 4.34810 | 1122.494 | -21.748 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
221.87 to 279.13 | 4.18630 | 1031.431 | -32.72 | Russell, Osborne, et al., 1942 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
1.4 | 150.2 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
0.380 | 137.6 | Domalski and Hearing, 1996 | CAL |
9.400 | 150.2 |
Enthalpy of phase transition
ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.05251 | 137.6 | crystaline, II | crystaline, I | Russell, Osborne, et al., 1942 | DH |
1.411 | 150.16 | crystaline, I | liquid | Russell, Osborne, et al., 1942 | DH |
Entropy of phase transition
ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.382 | 137.6 | crystaline, II | crystaline, I | Russell, Osborne, et al., 1942 | DH |
9.398 | 150.16 | crystaline, I | liquid | Russell, Osborne, et al., 1942 | DH |
References
Go To: Top, Condensed phase thermochemistry data, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Good, Lacina, et al., 1961
Good, W.D.; Lacina, J.L.; McCullough, J.P.,
Methanethiol and carbon disulfide: Heats of combustion and formation by rotating-bomb calorimetry,
J. Phys. Chem., 1961, 65, 2229-2231. [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]
Russell, Osborne, et al., 1942
Russell, H., Jr.; Osborne, D.W.; Yost, D.M.,
The heat capacity, entropy, heats of fusion, transition, and vaporization and vapor pressures of methyl mercaptan,
J. Am. Chem. Soc., 1942, 64, 165-169. [all data]
Morris, Lanum, et al., 1960
Morris, J.C.; Lanum, W.J.; Helm, R.V.; Haines, W.E.; Cook, G.L.; Ball, J.S.,
Purification and Properties of Ten Organic Sulfur Compounds,
J. Chem. Eng. Data, 1960, 5, 112-6. [all data]
Teets, 1934
Teets, D.E.,
The Relation of the Melting Point to the Number of Carbon Atoms in a Series of Normal Mercaptans,
J. Am. Chem. Soc., 1934, 56, 1143. [all data]
Ellis and Reid, 1932
Ellis, L.M.; Reid, E.E.,
The Preparation and Properties of A Double Series of Aliphatic Mercaptans,
J. Am. Chem. Soc., 1932, 54, 1674. [all data]
Timmermans and Mattaar, 1921
Timmermans, J.; Mattaar, J.F.,
Freezing points of orgainic substances VI. New experimental determinations.,
Bull. Soc. Chim. Belg., 1921, 30, 213. [all data]
Russell, Osborne, et al., 1942, 2
Russell, H.; Osborne, D.W.; Yost, D.M.,
The Heat Capacity, Entropy, Heats of Fusion, Transition and Vaporization and Vapor Pressures of Methyl Mercaptan,
J. Am. Chem. Soc., 1942, 64, 165-9. [all data]
Berthoud and Brum, 1924
Berthoud, A.; Brum, R.,
Physical Properties of Some Organic Compounds.,
J. Chim. Phys. Phys.-Chim. Biol., 1924, 21, 143-60. [all data]
Reid, 1972
Reid, Robert C.,
Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00,
AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637
. [all data]
Dykyj, Svoboda, et al., 1999
Dykyj, J.; Svoboda, J.; Wilhoit, R.C.; Frenkel, M.L.; Hall, K.R.,
Vapor Pressure of Chemicals: Part A. Vapor Pressure and Antoine Constants for Hydrocarbons and Sulfur, Selenium, Tellurium and Hydrogen Containing Organic Compounds, Springer, Berlin, 1999, 373. [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]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D.,
Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III,
J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985
. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid Pc Critical pressure S°liquid Entropy of liquid at standard conditions Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions ΔvapS Entropy of vaporization ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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