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Selected values are given for the thermochemical properties of the more common compounds of sodium and potassium. A more extensive set of selections is provided for rubidium compounds. The properties included where data are available, are enthalpy of formation at 0 K and 298.15 K Z^f(O) and AHf (298), Gibbs energy of formation, entropy and heat capacity at 298.15^f(298), S(298) and Cp(298), and the enthalpy difference between 0 K and 298.15 K, H(298)-H(0). The values are consistent with the tables issued earlier in the NBS Technical Note 270 series.

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Selected values are given for the thermochemica 1 properties of the compounds of thorium. They are obtained from a computer-assisted least sums-least squares approach to the evaluation of thermodynamic data networks. The properties given, where data are available, are enthalpy of formation, Gibbs energy of formation, and entropy at 298.15 K (AHf°(298), AGf°(298), and S°(298)). The values are consistent with the CODATA Key Values for Thermodynamics. The reaction catalog from which this self consistent set of values is generated is given with a statistical analysis. Some thermal functions are also given, as well as detailed comments when necessary.