The activation energy of a reaction is the difference in energy between the reac

Question

Theactivation energyof a reaction is the difference in energy between the reactants and the activated complex. Activation energy is always a positive number.

Learning Goal: To help you understand how to interpret potential energy diagrams. The graphs shown here are calledpotential energy diagrams. They show the potential energy of a system as it changes from reactants to products. The first graph shows the uncatalyzed reaction(Figure 1); the second graph shows the catalyzed reaction(Figure 2). Activation energy

Theactivation energyof a reaction is the difference in energy between the reactants and the activated complex. Activation energy is always a positive number.

Internal energy change

Theinternal energy change,, of a reaction is the difference in energy between the reactants and the products.may be positive or negative depending upon whether the reaction is endothermic or exothermic. To ensure that you always get the correct sign for, use the following equation:

Enthalpy change

Theenthalpy change,, of a reaction is equal to theinternal energy change,, for a reaction as long as the system is at constant pressure. This is very often the case and should be assumed for any problem unless you are told otherwise.

Part A What is the value of the activation energy of the uncatalyzed reaction?

Explanation / Answer

Oops, I mean 175 kJ.

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