NIST-JANAF Thermochemical Tables. III. Diatomic Hydrogen Halide ...

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2.4. Hydrogen Iodide
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Hydrogen iodide HI Ideal gas M r127.9124
fH o (0 K)28.6760.10 kJ•mol 1
S o (298.15 K)206.5890.005 J•K 1 •mol 1 fH o (298.15 K)26.500.10 kJ•mol 1
EG vG 0F
Molecular constants
Symmetry number: 1
Ground electronic state: X 1 Energy: X0 cm 1 Quantum weight: g X1
Vibrational and rotational levels cm 1
G v2308.975Y39.6112Y 2 2.741910 2 Y 3 1.687010 2 Y 4 3.873210 4 Y 5
5.51310 6 Y 6 2.714310 6 Y 7 1.403 2510 7 Y 8
F vB vZD vZ 2 H vZ 3 L vZ 4 L vZ 4 2 /H vZ 3 L vZ 4
B v6.511 6280.170 372Y 2 2.846910 4 Y 4 4.046510 5 Y 3 8.62510 6 Y 4
D v2.071 6810 4 7.86810 7 Y 1.67610 7 Y 2 2.8510 8 Y 3
H v2.97510 9 1.8710 10 Y
L v2.143 05310 13 where ZJJ1,Y v1/2
r e1.609 0830.000 004 Å.
2.4.1. Enthalpy of Formation
Enthalpy of formation of hydrogen iodide, HI, was recommended
by CODATA-ICSU 1 and is based on the results of
measurements of standard enthalpy of solution of HIg in
water (83.2830.085 kJ•mol 1 ) by Vanderzee and Geer. 2
The close but less accurate values of the enthalpy of formation
of HIg can be obtained from study of the equilibrium
of 2HI(g)I 2(g)H 2(g) by Taylor and Criste, 3 a determination
of the degree of decomposition of HIg by Rittenberg
and Urie, 4 a photocalorimetric study of the equilibrium of the
decomposition of HIg by Bright and Hagerty, 5 the theoretical
calculations of Murphy 6 and calorimetric determination
of the enthalpy of the reaction 2HI(g)Cl 22HCl(g)
I 2(g) by Günther and Wekua. 7 The accepted enthalpy of
J. Phys. Chem. Ref. Data, Vol. 33, No. 3, 2004
formation of HIg agrees with the values of enthalpy of
formation of the I ion in the state of standard aqueous solution
fH o I , sol. H 2O, stand. state, 298.15 K
56.780.05 kJ•mol 1
found in the calorimetric investigations by Johnson 8 and
adopted by CODATA-ICSU. 1
The dissociation energy, D 0(HI)24 62010 cm 1 , corresponds
to the accepted enthalpy of formation. The results
of studies of reaction HIeI H by Smith and Adams 9
agree with thermochemical data.