What is the Ea for the exothermic reaction on the right A) 268.74 kJ B) -171.08 kJ C) 88.00 kJ D) -259.09 kJ

Option C. 88 KJ

Explanation:

The activation energy (Ea) is the minimum energy that reactant must overcome in order for them to proceed to product.

In an energy profile diagram, the activation energy (Ea) is obtained by calculating the difference between the energy of the activation complex (i.e peak) and the energy of the reactant.

With the above information, we shall determine the activation energy (Ea) of the reaction above as follow:

Activation complex = 268.74 KJ

Energy of reactant = 180.74 KJ

Activation energy (Ea) =?

Activation energy = Activation complex – Energy of reactant

Activation energy = 268.74 – 180.74

Activation energy = 88 KJ

Therefore, the activation energy (Ea) of the reaction is 88 KJ

first one is the correct answer