Carbonyl sulfide

Formula: COS
Molecular weight: 60.075
IUPAC Standard InChI: InChI=1S/COS/c2-1-3
IUPAC Standard InChIKey: JJWKPURADFRFRB-UHFFFAOYSA-N
CAS Registry Number: 463-58-1
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: Carbon oxide sulfide; Carbon oxysulfide; COS; Oxycarbon sulfide; UN 2204; Carbon oxide sulphide; carbonyl sulphide
Permanent link for this species. Use this link for bookmarking this species for future reference.
Information on this page:
Other data available:
Data at other public NIST sites:
Options:
- Switch to SI units

Data at NIST subscription sites:

NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Gas Chromatography, References, Notes

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-33.081	kcal/mol	Review	Chase, 1998	Data last reviewed in March, 1966
Δ_fH°_gas	-33.21 ± 0.25	kcal/mol	Eqk	Bechtold, 1965	Reanalyzed by Cox and Pilcher, 1970, Original value = -33.93 kcal/mol; ALS
Δ_fH°_gas	-33.21 ± 0.25	kcal/mol	Eqk	Terres and Wesemann, 1932	Reanalyzed by Cox and Pilcher, 1970, Original value = -32.868 kcal/mol; ALS
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	55.347	cal/mol*K	Review	Chase, 1998	Data last reviewed in March, 1966

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
C_p = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K)	298. to 1200.	1200. to 6000.
A	8.255000	14.41740
B	10.29010	0.415471
C	-6.361791	-0.050187
D	1.515021	0.003372
E	-0.078278	-1.225831
F	-36.20939	-40.30371
G	62.09651	68.74890
H	-33.08009	-33.08009
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in March, 1966	Data last reviewed in March, 1966

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Gas Chromatography, References, Notes

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

+ Carbonyl sulfide = ( • )

By formula: F^- + COS = (F^- • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	31.8 ± 2.0	kcal/mol	IMRE	Larson and McMahon, 1985	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.	cal/mol*K	N/A	Larson and McMahon, 1985	gas phase; switching reaction,Thermochemical ladder(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	24.6 ± 2.0	kcal/mol	IMRE	Larson and McMahon, 1985	gas phase; B,M

+ Carbonyl sulfide = ( • )

By formula: CH₃⁺ + COS = (CH₃⁺ • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	57.2	kcal/mol	PHPMS	McMahon, Heinis, et al., 1988	gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 48.3 kcal/mol; Foster, Williamson, et al., 1974; M

Carbonyl sulfide + = +

By formula: COS + H₂O = CO₂ + H₂S

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-7.99 ± 0.23	kcal/mol	Eqk	Terres and Wesemann, 1932	gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -8.522 kcal/mol; ALS

Carbonyl sulfide = +

By formula: COS = CO + S

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.77 ± 0.06	kcal/mol	Eqk	Bechtold, 1965	gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = 7.25 kcal/mol; ALS

(COS⁺ • Carbonyl sulfide ) + = (COS⁺ • 2)

By formula: (COS⁺ • COS) + COS = (COS⁺ • 2COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.6	kcal/mol	PI	Ono, Osuch, et al., 1981	gas phase; M

COS⁺ + Carbonyl sulfide = (COS⁺ • )

By formula: COS⁺ + COS = (COS⁺ • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.2	kcal/mol	PI	Ono, Osuch, et al., 1981	gas phase; M

CS₂⁺ + Carbonyl sulfide = (CS₂⁺ • )

By formula: CS₂⁺ + COS = (CS₂⁺ • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.8	kcal/mol	PI	Ono, Osuch, et al., 1981	gas phase; M

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, Gas Chromatography, References, Notes

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	11.18 ± 0.01	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	150.2	kcal/mol	N/A	Hunter and Lias, 1998	at S; HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	144.0	kcal/mol	N/A	Hunter and Lias, 1998	at S; HL
Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_{(+) ion}	224.	kcal/mol	N/A	N/A
Quantity	Value	Units	Method	Reference	Comment
Δ_fH_{(+) ion,0K}	224.	kcal/mol	N/A	N/A

Electron affinity determinations

EA (eV)	Method	Reference	Comment
0.46 ± 0.20	NBIE	Compton, Reinhardt, et al., 1975	See Surber, Ananthavel, et al., 2002, for a claim that EA<0; G3MP2B3 calculations indicate an EA of ca. -0.05 eV, unbound. At the bent geometry of the anion, G3MP2B3 EDE(vert)=0.35 eV bound. The experiment appears to be the vertical EA.; B
>0.39995	ECD	Chen and Wentworth, 1983	B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
11.185 ± 0.002	PE	Wang, Reutt, et al., 1988	LL
11. ± 1.	EI	Carnovale, Hitchcock, et al., 1982	LBLHLM
11.1736 ± 0.0015	PI	Ono, Osuch, et al., 1981	LLK
11.177 ± 0.002	PE	Potts and Fattahallah, 1980	LLK
11.19 ± 0.05	EI	Hubin-Franskin, Marmet, et al., 1980	LLK
11.174 ± 0.003	PE	Delwiche, Hubin-Franskin, et al., 1980	LLK
11.190	PI	Frey, Gotchev, et al., 1978	LLK
11.22	PE	Natalis, 1973	LLK
11.18 ± 0.01	PE	Frost, Lee, et al., 1973	LLK
11.3	EI	Ferreira and Costa, 1972	LLK
11.189 ± 0.005	PE	Brundle and Turner, 1969	RDSH
11.233 ± 0.005	PE	Brundle and Turner, 1969	RDSH
11.18 ± 0.01	PI	Matsunaga and Watanabe, 1967	RDSH
11.18 ± 0.01	S	Matsunaga and Watanabe, 1967	RDSH
11.22 ± 0.01	PI	Matsunaga and Watanabe, 1967	RDSH
11.23 ± 0.01	S	Matsunaga and Watanabe, 1967	RDSH
11.18 ± 0.01	PI	Dibeler and Walker, 1967	RDSH
11.22	PI	Dibeler and Walker, 1967	RDSH
11.19	PE	Potts and Williams, 1974	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
C⁺	22. ± 1.	?	EI	Carnovale, Hitchcock, et al., 1982	LBLHLM
CO⁺	18. ± 1.	S	EI	Carnovale, Hitchcock, et al., 1982	LBLHLM
CO⁺	15.6	S(^-)?	EI	Ferreira and Costa, 1972	LLK
CS⁺	20. ± 1.	O	EI	Carnovale, Hitchcock, et al., 1982	LBLHLM
CS⁺	18.7 ± 0.5	O	EI	Hubin-Franskin, Huard, et al., 1978	LLK
CS⁺	16.7	O(^-)?	EI	Ferreira and Costa, 1972	LLK
O⁺	20. ± 1.	CS	EI	Carnovale, Hitchcock, et al., 1982	LBLHLM
O⁺	19.45 ± 0.08	CS(^-)	EI	Hubin-Franskin, Huard, et al., 1978	LLK
OS⁺	19.8	C	EI	Ferreira and Costa, 1972	LLK
S⁺	14. ± 1.	CO	EI	Carnovale, Hitchcock, et al., 1982	LBLHLM
S⁺	13.52 ± 0.05	CO	EI	Hubin-Franskin, Huard, et al., 1978	LLK
S⁺	13.7	CO	EI	Ferreira and Costa, 1972	LLK
S⁺	13.65 ± 0.03	CO	PI	Dibeler and Walker, 1967	RDSH

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Gas Chromatography, References, Notes

Data compiled as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
B - John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

+ Carbonyl sulfide = ( • )

By formula: CH₃⁺ + COS = (CH₃⁺ • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	57.2	kcal/mol	PHPMS	McMahon, Heinis, et al., 1988	gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 48.3 kcal/mol; Foster, Williamson, et al., 1974; M

COS⁺ + Carbonyl sulfide = (COS⁺ • )

By formula: COS⁺ + COS = (COS⁺ • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.2	kcal/mol	PI	Ono, Osuch, et al., 1981	gas phase; M

(COS⁺ • Carbonyl sulfide ) + = (COS⁺ • 2)

By formula: (COS⁺ • COS) + COS = (COS⁺ • 2COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.6	kcal/mol	PI	Ono, Osuch, et al., 1981	gas phase; M

CS₂⁺ + Carbonyl sulfide = (CS₂⁺ • )

By formula: CS₂⁺ + COS = (CS₂⁺ • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.8	kcal/mol	PI	Ono, Osuch, et al., 1981	gas phase; M

+ Carbonyl sulfide = ( • )

By formula: F^- + COS = (F^- • COS)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	31.8 ± 2.0	kcal/mol	IMRE	Larson and McMahon, 1985	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.	cal/mol*K	N/A	Larson and McMahon, 1985	gas phase; switching reaction,Thermochemical ladder(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	24.6 ± 2.0	kcal/mol	IMRE	Larson and McMahon, 1985	gas phase; B,M

Gas Chromatography

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References, Notes

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Kovats' RI, non-polar column, isothermal

View large format table.

Column type	Active phase	Temperature (C)	I	Reference	Comment
Packed	Squalane	27.	301.	Hively and Hinton, 1968	He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm
Packed	Squalane	49.	303.	Hively and Hinton, 1968	He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm
Packed	Squalane	67.	304.	Hively and Hinton, 1968	He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm
Packed	Squalane	86.	305.	Hively and Hinton, 1968	He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm

Van Den Dool and Kratz RI, polar column, custom temperature program

View large format table.

Column type	Active phase	I	Reference	Comment
Capillary	CP-Wax 52CB	680.	Condurso, Verzera, et al., 2006	60. m/0.25 mm/0.25 μm, He; Program: 45C(5min) => 10C/min => 80C => 2C/min => 240C

Normal alkane RI, non-polar column, temperature ramp

View large format table.

Column type	Active phase	I	Reference	Comment
Capillary	OV-101	277.	Zenkevich, 2005	25. m/0.20 mm/0.10 μm, N2/He, 6. K/min; T_start: 50. C; T_end: 250. C

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Gas Chromatography, Notes

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Bechtold, 1965
Bechtold, V.E., Bestimmung des Standardwertes der freien Reaktionsenthalpie für die Bildung von Kohlenoxysulfid aus Kohlenmonoxyd, Ber. Bunsenges. Phys. Chem., 1965, 69, 326-328. [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]

Terres and Wesemann, 1932
Terres, E.; Wesemann, H., Uber Gleichgewichtsmessungen der teilreaktionen bei der umsetzung von scnwefelkohlenstoff mit wasserdampf im temperaturgebiet von 350° bis 900° C, Angew. Chem., 1932, 45, 795-832. [all data]

Larson and McMahon, 1985
Larson, J.W.; McMahon, T.B., Fluoride and chloride affinities of the main group oxides, fluorides, oxofluorides, and alkyls. Quantitative scales of lewis acidities from ICR halide exchange equilibria, J. Am. Chem. Soc., 1985, 107, 766. [all data]

Arshadi, Yamdagni, et al., 1970
Arshadi, M.; Yamdagni, R.; Kebarle, P., Hydration of Halide Negative Ions in the Gas Phase. II. Comparison of Hydration Energies for the Alkali Positive and Halide Negative Ions, J. Phys. Chem., 1970, 74, 7, 1475, https://doi.org/10.1021/j100702a014 . [all data]

McMahon, Heinis, et al., 1988
McMahon, T.; Heinis, T.; Nicol, G.; Hovey, J.K.; Kebarle, P., Methyl Cation Affinities, J. Am. Chem. Soc., 1988, 110, 23, 7591, https://doi.org/10.1021/ja00231a002 . [all data]

Foster, Williamson, et al., 1974
Foster, M.S.; Williamson, A.D.; Beauchamp, J.L., Photoionization mass spectrometry of trans-azomethane, Int. J. Mass Spectrom. Ion Phys., 1974, 15, 429. [all data]

Ono, Osuch, et al., 1981
Ono, Y.; Osuch, E.A.; Ng, C.Y., Molecular beam photoionization study of OCS, (OCS)₂, (OCS)₃, and OCS.CS₂, J. Chem. Phys., 1981, 74, 1645. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Compton, Reinhardt, et al., 1975
Compton, R.N.; Reinhardt, P.W.; Cooper, C.D., Collisional ionization of Na, K, and Cs by CO₂, COS, and CS₂: Molecular electron affinities, J. Chem. Phys., 1975, 63, 3821. [all data]

Surber, Ananthavel, et al., 2002
Surber, E.; Ananthavel, S.P.; Sanov, A., Nonexistent electron affinity of OCS and the stabilization of carbonyl sulfide anions by gas phase hydration, J. Chem. Phys., 2002, 116, 5, 1920-1929, https://doi.org/10.1063/1.1433001 . [all data]

Chen and Wentworth, 1983
Chen, E.C.M.; Wentworth, W.E., Determination of molecular electron affinities using the electron capture detector in the pulse sampling mode at steady state, J. Phys. Chem., 1983, 87, 45. [all data]

Wang, Reutt, et al., 1988
Wang, L.; Reutt, J.E.; Lee, Y.T.; Shirley, D.A., High resolution UV photoelectron spectroscopy of CO₂, COS, and CS₂ using supersonic molecular beams, J. Electron Spectrosc. Relat. Phenom., 1988, 47, 167. [all data]

Carnovale, Hitchcock, et al., 1982
Carnovale, F.; Hitchcock, A.P.; Cook, J.P.D.; Brion, C.E., Absolute dipole oscillator strengths for molecular and dissociative photoionization of Cos(10 - 50eV) and CS₂(10 - 40eV), Chem. Phys., 1982, 66, 249. [all data]

Potts and Fattahallah, 1980
Potts, A.W.; Fattahallah, G.H., High-resolution ultraviolet photoelectron spectroscopy of CO₂, COS and CS₂, J. Phys. B:, 1980, 13, 2545. [all data]

Hubin-Franskin, Marmet, et al., 1980
Hubin-Franskin, M.-J.; Marmet, P.; Huard, D., Excitation and ionization of OCS and CS₂ by electron impact, Int. J. Mass Spectrom. Ion Phys., 1980, 33, 311. [all data]

Delwiche, Hubin-Franskin, et al., 1980
Delwiche, J.; Hubin-Franskin, M.-J.; Caprace, G.; Natalis, P.; Roy, D., On the He(I) and Ne(I) photoelectron spectra of OCS, J. Electron Spectrosc. Relat. Phenom., 1980, 21, 205. [all data]

Frey, Gotchev, et al., 1978
Frey, R.; Gotchev, B.; Peatman, W.B.; Pollak, H.; Schlag, E.W., Photoionization resonance study of the X(²π), A(²π), B(²Σ⁺) and C(²Σ⁺) states of CS₂⁺ and CO_S⁺, Int. J. Mass Spectrom. Ion Phys., 1978, 26, 137. [all data]

Natalis, 1973
Natalis, P., Contribution a la spectroscopie photoelectronique. Effets de l'autoionisation dans less spectres photoelectroniques de molecules diatomiques et triatomiques, Acad. R. Belg. Mem. Cl. Sci. Collect. 8, 1973, 41, 1. [all data]

Frost, Lee, et al., 1973
Frost, D.C.; Lee, S.T.; McDowell, C.A., Photoelectron spectra of OCSe, SCSe, and CSe₂, J. Chem. Phys., 1973, 59, 5484. [all data]

Ferreira and Costa, 1972
Ferreira, M.A.A.; Costa, M.L., Impacto electronico no oxi-sulfureto de carbono: potenciais de aparecimento de io~es positivos, calores de formaca~o e energias de dissociaca~o, Rev. Port. Quim., 1972, 14, 21. [all data]

Brundle and Turner, 1969
Brundle, C.R.; Turner, D.W., Studies on the photoionisation of the linear triatomic molecules: N₂O, COS, CS₂ and CO₂ using high-resolution photoelectron spectroscopy, Intern. J. Mass Spectrom. Ion Phys., 1969, 2, 195. [all data]

Matsunaga and Watanabe, 1967
Matsunaga, F.M.; Watanabe, K., Ionization potential and absorption coefficient of COS, J. Chem. Phys., 1967, 46, 4457. [all data]

Dibeler and Walker, 1967
Dibeler, V.H.; Walker, J.A., Mass spectrometric study of the photoionization of small polyatomic molecules, Advan. Mass Spectrom., 1967, 4, 767. [all data]

Potts and Williams, 1974
Potts, A.W.; Williams, T.A., The observation of "forbidden" transitions in He II photoelectron spectra, J. Electron Spectrosc. Relat. Phenom., 1974, 3, 3. [all data]

Hubin-Franskin, Huard, et al., 1978
Hubin-Franskin, M.J.; Huard, D.; Marmet, P., On the heat of formation of CS from CS₂ and OCS, Int. J. Mass Spectrom. Ion Phys., 1978, 27, 263. [all data]

Hively and Hinton, 1968
Hively, R.A.; Hinton, R.E., Variation of the retention index with temperature on squalane substrates, J. Gas Chromatogr., 1968, 6, 4, 203-217, https://doi.org/10.1093/chromsci/6.4.203 . [all data]

Condurso, Verzera, et al., 2006
Condurso, C.; Verzera, A.; Romeo, V.; Ziino, M.; Trozzi, A.; Ragusa, S., The leaf volatile constituents of Isatis tinctoria by solid-phase microextraction and gas chromatography/mass spectrometry, Planta Medica, 2006, 72, 10, 924-928, https://doi.org/10.1055/s-2006-946679 . [all data]

Zenkevich, 2005
Zenkevich, I.G., Experimentally measured retention indices., 2005. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Gas Chromatography, References

Symbols used in this document:

AE	Appearance energy
EA	Electron affinity
IE (evaluated)	Recommended ionization energy
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
Δ_fH_{(+) ion,0K}	Enthalpy of formation of positive ion at 0K
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.