Cyanogen

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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.

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

Quantity Value Units Method Reference Comment
Δfgas73.870kcal/molReviewChase, 1998Data last reviewed in March, 1961
Δfgas73.84 ± 0.43kcal/molCcbKnowlton and Prosen, 1951ALS
Δfgas62.9kcal/molCmMcMorris and Badger, 1933ALS
Δfgas73.30 ± 0.20kcal/molCcbWartenberg and Schutza, 1933Reanalyzed by Cox and Pilcher, 1970, Original value = 72.8 ± 0.2 kcal/mol; ALS
Quantity Value Units Method Reference Comment
Δcgas-261.94 ± 0.43kcal/molCcbKnowlton and Prosen, 1951ALS
Δcgas-251.4 ± 1.2kcal/molCmMcMorris and Badger, 1933ALS
Δcgas-261.40 ± 0.20kcal/molCcbWartenberg and Schutza, 1933Reanalyzed by Cox and Pilcher, 1970, Original value = -261.3 ± 0.2 kcal/mol; ALS
Quantity Value Units Method Reference Comment
gas,1 bar57.737cal/mol*KReviewChase, 1998Data last reviewed in March, 1961

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. - 1300.1300. - 6000.
A 12.3549019.83990
B 8.7938600.528003
C -2.978380-0.100319
D 0.1677350.006615
E -0.102472-2.224821
F 69.4778063.10569
G 69.6196075.45870
H 73.8701073.87010
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in March, 1961 Data last reviewed in March, 1961

Condensed phase thermochemistry data

Go To: Top, Gas 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: Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
liquid33.181cal/mol*KN/ARuehrwein and Giauque, 1939 

Constant pressure heat capacity of liquid

Cp,liquid (cal/mol*K) Temperature (K) Reference Comment
25.270255.Ruehrwein and Giauque, 1939T = 15 to 252 K.

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry 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]

Knowlton and Prosen, 1951
Knowlton, J.W.; Prosen, E.J., Heat of combustion and formation of cyanogen, J. Res. NBS, 1951, 46, 489-495. [all data]

McMorris and Badger, 1933
McMorris, J.; Badger, R.M., The heat of combustion, entropy and free energy of cyanogen gas, J. Am. Chem. Soc., 1933, 55, 1952-1957. [all data]

Wartenberg and Schutza, 1933
Wartenberg, H.V.; Schutza, H., Die verbrennungswarme des cyans, Z. Phys. Chem., 1933, 164, 386-388. [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]

Ruehrwein and Giauque, 1939
Ruehrwein, R.A.; Giauque, W.F., The entropy of cyanogen. Heat capacity and vapor pressure of solid and liquid. Heats of fusion and vaporization, J. Am. Chem. Soc., 1939, 61, 2940-2944. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, References