Activation Energy Diagram Chemistry. Clno 2 g no g no 2 g clno g. In this diagram the activation energy is signified by the hump in the reaction pathway and is labeled.
11500 j mol 23 kj mol x 1000 34500 j mol. It is obvious that the activation energy e a in the arrhenius equation must have the units of energy. Activation energy diagrams always incorporate the energetics δg or δh of the net reaction but it is important to understand that the latter quantities depend solely on the thermodynamics of the process which are always independent of the reaction pathway.
Effect of a catalyst.
Ln k 2 k 1 e a r x 1 t 1 1 t 2 where e a the activation energy of the reaction in j mol r the ideal gas constant 8 3145 j k mol t 1 and t 2 absolute temperatures in kelvin k 1 and k 2 the reaction rate constants at t 1 and t 2. The activation energy of chemical reactions only a small fraction of the collisions between reactant molecules convert the reactants into the products of the reaction. If e 2 e 1 the reaction is exothermic but when e 2 e 1 the chemical transformation is endothermic. Reacting particles must have enough energy so that when they collide they can overcome that barrier see figure below.
