Question

In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of theproducts is 5 kJ. The maximum energy of the system is 40 kJ.
Sketch a potential energy diagram for this reaction. Make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpychange for the reaction.

What is the activation energy for this reaction? 40-30=10kjc.
What is the enthalpy change for this reaction? 5-30= -25kjd.

Answer 1

Answer: Activation energy = 10 kJ

enthalpy change = -25 kJ

Explanation:

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

Given : Potential energy of the reactants = 30 kJ

Potential energy of the products = 5 kJ

Maximum energy of the system = 40 kJ.

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

Activation energy = Maximum energy of the system - Potential energy of the reactants = (40-30) kJ =10 kJ

Enthalpy change = Potential energy of the products - Potential energy of the reactants =(5-30) kJ= -25 kJ