Enthalpy Level Diagram
A diagram plotting the enthalpies of reactants and products to show the direction and size of the enthalpy change.
Unit
kJ/mol
In depth
Products are drawn below the reactants for an exothermic reaction and above for an endothermic one, with the vertical gap representing ΔH. Adding the transition state gives a full reaction profile, in which the activation energy appears as the height of the barrier.
Examples in the real world
A diagram showing methane and oxygen 890 kJ above carbon dioxide and water.