Abstract
Interaction energies of atoms which are next‐nearest neighbors have been determined from thermodynamic data for a number of carbon and sulfur molecules. When these interactions are taken into account, bond energies are found to be constant to a high degree of precision. Additional factors which have been considered include thermal and zero‐point energies, interactions of more distant neighbors, trigonal interactions, and ring strain.Simple equations for the prediction of unknown heats of formation are developed.