Iodine

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Gas phase thermochemistry data

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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
Δfgas14.92 ± 0.02kcal/molReviewCox, Wagman, et al., 1984CODATA Review value
Δfgas14.92kcal/molReviewChase, 1998Data last reviewed in June, 1982
Quantity Value Units Method Reference Comment
gas,1 bar62.306 ± 0.001cal/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar62.306cal/mol*KReviewChase, 1998Data 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) 457.666 to 2000.2000. to 6000.
A 9.03385118.33990
B 0.053884-0.966965
C -0.218106-0.441717
D 0.2473500.052353
E -0.020035-19.69260
F 12.15790-12.87560
G 73.1166167.21479
H 14.9190014.91900
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1982 Data last reviewed in June, 1982

Condensed phase thermochemistry data

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.

Quantity Value Units Method Reference Comment
Δfliquid3.231kcal/molReviewChase, 1998Data last reviewed in June, 1982
Quantity Value Units Method Reference Comment
liquid,1 bar35.937cal/mol*KReviewChase, 1998Data last reviewed in June, 1982
Quantity Value Units Method Reference Comment
solid,1 bar27.758 ± 0.072cal/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
Quantity Value Units Method Reference Comment
solid27.758cal/mol*KReviewChase, 1998Data 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
ReferenceChase, 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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View table.

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
ReferenceChase, 1998
Comment Data last reviewed in June, 1982

Phase change data

Go To: Top, Gas phase thermochemistry data, 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.

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
311.9 to 456.3.358581039.159-146.589Stull, 1947Coefficents calculated by NIST from author's data.

References

Go To: Top, Gas phase thermochemistry data, 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.

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]

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, Condensed phase thermochemistry data, Phase change data, References