When ammonia reacts with fluorine, how much heat is evolved or absorbed per mole of NH3 that reacts?

When ammonia (NH3) reacts with fluorine (F2), the reaction is highly exothermic, meaning that it releases a substantial amount of heat. The heat evolved during the reaction is indicative of the bond energies involved and the stability of the products formed compared to the reactants.

In this reaction, one mole of ammonia reacts with fluorine to produce nitrogen trifluoride (NF3) and hydrogen fluoride (HF), along with releasing heat. The specific value of -867 kJ/mol indicates that 867 kJ of heat is released for each mole of ammonia that reacts. The negative sign denotes an exothermic reaction, signifying that energy is given off rather than absorbed.

Understanding this heat release is crucial in thermodynamics, as it helps to illustrate the energy changes that accompany chemical reactions. The magnitude of the value also emphasizes the strong bonds formed in the products compared to the bonds in the reactants, contributing to the overall energy change. This knowledge is important for predicting the behavior of chemical reactions and for applications in fields such as engineering and environmental science.