Our refined value for the enthalpy of formation from the elements at 298.15 K for Mg-Al disordered, end-member pargasite with X-F=0 lies between -12651.4+/-12.7 and -12659.4+/-14.0 kJ/mol, depending on the internally consistent thermodynamic data set used for the reaction components. This...
The H–H bond energy is 431 kJ mol−1, the heat of formation of LiH is −90.4 kJ mol−1, and the lattice energy of LiH is 916 kJ mol−1. Use these data and those shown in Table 4.1 to construct a thermochemical cycle and determine the electron affinity of the hydrogen atom...