Reference Label	Details
Johnson 1973	G. K. Johnson, P. N. Smith, and W. N. Hubbard, J. Chem. Thermodyn. 5, 793-809 (1973) The Enthalpies of Solution and Neutralization of HF(l); Enthalpies of Dilution and Derived Thermodynamic Properties of HF(aq)
Settle 1994	J. L. Settle, E. Greenberg, W. N. Hubbard, and P. A. G. O'Hare, J. Chem. Thermodyn. 26, 435-448 (1994) The Standard Molar Enthalpy of Formation of Liquid Hydrogen Fluoride DeltafH°m(HF, l) at the Temperature 298.15 K Determined by Direct Combination of the Elements in a Fluorine-Bomb Calorimeter
note HF	Johnson 1973 refers to unpublished data for 1/2 {H2 } + 1/2 {F2 } -> {HF } DH298 = -72.55 +- 0.06 kcal/mol (see Settle 1994), and Vanderzee 1970 reports {HF } -> {HF } DH298 = 7231 +- 25 cal/mol; from these CODATA Key Vals obtains -273.30 +- 0.70 kJ/mol, where the uncertainty appears to come from the spectroscopic D0 of Di Lonardo 1973 which they also quote; however, the result seems to be coupled to DH298(F- ) = -335.35 +- 0.65 kJ/mol. Note that Settle 1994, which is the unpublished data referred to by Johnson 1973 reports 1/2 {H2 } + 1/2 {F2 } -> {HF } DH298 = -303.56 +- 0.27 kJ/mol = -72.55 +- 0.06 kcal/mol, but also gives a slightly refined DH298(F- ) = -335.66 +- 0.31 kJ/mol = -80.22 +- 0.07 kcal/mol, the same as what they reported before in Johnson 1973. Vanderzee 1971 (missquoted by CODATA Key Vals instead of Vanderzee 1970) reports {HF } -> {H+ } + {F- } DH298 = -14.72 +- 0.10 kcal/mol. From this and DH298(F- ) one obtains DHf298{HF } =-65.50 +- 0.12 kcal/mol.