All these halides are colourless, high melting crystalline solids having high negative enthalpies of formation. Historically, the vast majority of tabulated bond energy values are bond enthalpies. As expected, with an increase in substituent size, the equilibrium enthalpies between rotamers also increases. They contribute to the conformational and the net enthalpies of local and non-local interactions. This allows the calculation of densities, enthalpies, heat capacities, and other properties. This allows the calculation of densities, enthalpies, heat capacities, and more. The standard enthalpies of formation reflect the increasing thermal instability going down the group. Various definitions exist in terms of enthalpies, pressures or flow geometry of the device. This curve can be used to calculate enthalpies of transitions. This is true for all enthalpies of formation. Such an approach was used to revise primary alkylamine enthalpies of formation. Participants were also encouraged to submit predictions for binding enthalpies.