Heat capacities and thermodynamic properties of ThH2 and ThH3.75 to 1000 K

The heat capacities of ThH2.00 and ThH3.75 have been measured in the temperature range 5 to 350 K by the adiabatic method. These heat capacities were represented by a sum of terms each of which could be extrapolated to higher temperatures to obtain Cp for each hydride. Tabular values of the heat capacity Cp, the entropy So, the function, {Ho(T) − Ho(0)}, and the function −{Go(T) − Ho(0)}T are presented at selected temperatures to 1000 K. These results together with thermochemical results derived from hydrogen dissociation-pressure measurements were used to calculate standard enthalpies and entropies of formation of ThH2 and ThH3.75 from 298.15 to 1000 K.