Chlorine
- Formula: Cl2
- Molecular weight: 70.906
- IUPAC Standard InChIKey: KZBUYRJDOAKODT-UHFFFAOYSA-N
- CAS Registry Number: 7782-50-5
- 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: Cl2; Bertholite; Chloor; Chlor; Chlore; Chlorine mol.; Cloro; Molecular chlorine; UN 1017; Diatomic chlorine
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Gas phase thermochemistry data
Go To: Top, Phase change data, Mass spectrum (electron ionization), References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
S°gas,1 bar | 53.3176 ± 0.0024 | cal/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
S°gas,1 bar | 53.317 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1982 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = 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
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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Temperature (K) | 298. to 1000. | 1000. to 3000. | 3000. to 6000. |
---|---|---|---|
A | 7.899283 | 10.20012 | -10.17053 |
B | 2.922897 | -1.197316 | 9.963122 |
C | -2.883629 | 0.455215 | -1.703354 |
D | 1.048120 | -0.039589 | 0.092696 |
E | -0.038120 | -0.501549 | 24.17400 |
F | -2.589580 | -4.132362 | 31.73136 |
G | 61.90942 | 64.49331 | 63.28537 |
H | 0.000000 | 0.000000 | 0.000000 |
Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
Comment | Data last reviewed in June, 1982 | Data last reviewed in June, 1982 | Data last reviewed in June, 1982 |
Phase change data
Go To: Top, Gas phase thermochemistry data, Mass spectrum (electron ionization), 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
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 239.5 | K | N/A | Thiele and Schulte, 1920 | Uncertainty assigned by TRC = 0.6 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 172.17 ± 0.05 | K | N/A | Angus, Armstrong, et al., 1984 | Uncertainty assigned by TRC = 0.05 K; TRC |
Ttriple | 172.12 | K | N/A | Giauque and Powell, 1939 | Uncertainty assigned by TRC = 0.15 K; mean of 5 measurements with thermocouple and Pt res. therm., To = 273.10 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ptriple | 0.01374 ± 0.00003 | atm | N/A | Angus, Armstrong, et al., 1984 | Uncertainty assigned by TRC = 0.00003 atm; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 416.956 | K | N/A | Angus, Armstrong, et al., 1984 | TRC |
Tc | 416.9 | K | N/A | Ambrose, Hall, et al., 1979 | Uncertainty assigned by TRC = 0.5 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 78.869 | atm | N/A | Angus, Armstrong, et al., 1984 | TRC |
Pc | 78.73 | atm | N/A | Ambrose, Hall, et al., 1979 | Uncertainty assigned by TRC = 0.49 atm; Visual, uncertain because of reactivity of element.; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 8.1344 | mol/l | N/A | Angus, Armstrong, et al., 1984 | TRC |
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 |
---|---|---|---|---|---|
155. to 239.4 | 3.0156 | 530.591 | -64.639 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
239.4 to 400.3 | 4.28243 | 969.992 | -12.791 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, 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 by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
Due to licensing restrictions, this spectrum cannot be downloaded.
Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | Crystal Harrison, SCOTT SPECIALTY GASES Inc., NJ |
NIST MS number | 245871 |
References
Go To: Top, Gas phase thermochemistry data, Phase change data, Mass spectrum (electron ionization), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A.,
CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Thiele and Schulte, 1920
Thiele, A.; Schulte, E.,
Binary equilibrium systems with solid carbon dioxide,
Z. Phys. Chem., Stoechiom. Verwandtschaftsl., 1920, 96, 312-42. [all data]
Angus, Armstrong, et al., 1984
Angus, S.; Armstrong, B.; de Reuck, K.M.,
International Thermodynamic Tables of the Fluid State - Chlorine, Pergamon, Oxford, 1984. [all data]
Giauque and Powell, 1939
Giauque, W.F.; Powell, T.M.,
Chlorine. The Heat Capacity, Vapor Pressure, Heats of Fusion and Vaporiza- tion, and Entropy,
J. Am. Chem. Soc., 1939, 61, 1970. [all data]
Ambrose, Hall, et al., 1979
Ambrose, D.; Hall, D.J.; Lee, D.A.; Lewis, G.B.,
Vapor pressure of chlorine,
J. Chem. Thermodyn., 1979, 11, 1089. [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]
Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, Mass spectrum (electron ionization), References
- Symbols used in this document:
Pc Critical pressure Ptriple Triple point pressure S°gas,1 bar Entropy of gas at standard conditions (1 bar) Tboil Boiling point Tc Critical temperature Ttriple Triple point temperature ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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