Iodine
- Formula: I2
- Molecular weight: 253.80894
- IUPAC Standard InChI: InChI=1S/I2/c1-2
- IUPAC Standard InChIKey: PNDPGZBMCMUPRI-UHFFFAOYSA-N
- CAS Registry Number: 7553-56-2
- 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: I2; Eranol; Iode; Iodine-127; Iodio; Iosan Superdip; Jod; Jood; Molecular iodine; Tincture iodine; Vistarin; Iodine crystals; Iodine sublimed; Diiodine; Diatomic iodine
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Condensed phase thermochemistry data
Go To: Top, Henry's Law data, 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 |
|---|---|---|---|---|---|
| ΔfH°liquid | 3.231 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1982 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 35.937 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1982 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 27.758 ± 0.072 | cal/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 27.758 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1982 |
Liquid 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) | 386.75 to 457.666 |
|---|---|
| A | 19.28040 |
| B | 1.638540×10-8 |
| C | -2.085170×10-8 |
| D | 8.898500×10-9 |
| E | 1.131891×10-10 |
| F | -2.516210 |
| G | 59.26860 |
| H | 3.232080 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1982 |
Solid 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 386.75 |
|---|---|
| A | -46.78860 |
| B | 219.6220 |
| C | -257.9450 |
| D | 127.7060 |
| E | 1.232410 |
| F | 10.34880 |
| G | -77.07409 |
| H | 0.000000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1982 |
Henry's Law 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 by: Rolf Sander
Henry's Law constant (water solution)
kH(T) = k°H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K)))
k°H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(kH))/d(1/T) = Temperature dependence constant (K)
| k°H (mol/(kg*bar)) | d(ln(kH))/d(1/T) (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 3.0 | 4400. | R | N/A | |
| 1.1 | C | N/A | missing citation quote a paper as the source that gives only the solubility but not the Henry's law constant. | |
| 3.3 | 4800. | T | N/A | |
| 3.1 | 4600. | R | N/A |
References
Go To: Top, Condensed phase thermochemistry data, Henry's Law data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
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]
Notes
Go To: Top, Condensed phase thermochemistry data, Henry's Law data, References
- Symbols used in this document:
S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions S°solid,1 bar Entropy of solid at standard conditions (1 bar) d(ln(kH))/d(1/T) Temperature dependence parameter for Henry's Law constant k°H Henry's Law constant at 298.15K ΔfH°liquid Enthalpy of formation of liquid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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