chemical thermodynamics of neptunium and plutonium - U.S. ...

66 5. Selected auxiliary dataHCO − 3 ,CO2− 3and H 2 PO − 4, which were absent form the corresponding Table 5.2 in[92GRE/FUG], are included in this volume to provide the user of selected data for speciesof neptunium and plutonium (cf. Chapters 3 and 4) with the data needed to obtainthe lowest possible uncertainties on reaction properties.Note that the values in Tables 5.1 and 5.2 may contain more digits than those listedin either [89COX/WAG] or in Chapter VI of [92GRE/FUG], because the data in thepresent chapter are retrieved directly from the computerized data base and rounded tothree digits after the decimal point throughout.Table 5.1: Selected thermodynamic data for auxiliary compounds and complexes,including the CODATA Key Values [89COX/WAG] of species not containing uranium,as well as other data that were evaluated in Chapter VI of the uranium review[92GRE/FUG]. All ionic species listed in this table are aqueous species. Unless notedotherwise, all data refer to 298.15 K and a pressure of 0.1 MPa and, for aqueous species,a reference state or standard state of infinite dilution (I = 0). The uncertaintieslisted below each value represent total uncertainties and correspond in principle to thestatistically defined 95% confidence interval. Values in bold typeface are CODATAKey Values and are taken directly from Ref. [89COX/WAG] without further evaluation.Values obtained from internal calculation, cf. footnotes (a) and (b), are rounded at thethird digit after the decimal point and may therefore not be exactly identical to thosegiven in Chapter VI of Ref. [92GRE/FUG]. Systematically, all the values are presentedwith three digits after the decimal point, regardless of the significance of these digits.The data presented in this table are available on PC diskettes or other computer mediafrom the OECD Nuclear Energy Agency.Compound f G ◦ m f Hm ◦ Sm ◦ Cp,m◦(kJ · mol −1 ) (kJ · mol −1 ) (J · K −1 · mol −1 ) (J · K −1 · mol −1 )O(g) 231.743 (a) 249.180 161.059 21.912±0.100 ±0.100 ±0.003 ±0.001O 2 (g) 0.000 0.000 205.152 29.378±0.005 ±0.003H(g) 203.276 (a) 217.998 114.717 20.786±0.006 ±0.006 ±0.002 ±0.001H + 0.000 0.000 0.000 0.000H 2 (g) 0.000 0.000 130.680 28.836±0.003 ±0.002OH − −157.220 (a) −230.015 −10.900±0.072 ±0.040 ±0.200H 2 O(g) −228.582 (a) −241.826 188.835 33.609±0.040 ±0.040 ±0.010 ±0.030H 2 O(l) −237.140 (a) −285.830 69.950 75.351±0.041 ±0.040 ±0.030 ±0.080H 2 O 2 (aq)−191.170 (c)±0.100(Continued on next page)