Q.8Answer the following question on the basis of the given plot of potential energy vs reaction coordinate. (i) What is the threshold energy for the reaction (ii) What is the activation energy for forward reaction (iii) What is the activation energy for backward reaction. (iv) What is enthalpy change for the forward reaction?
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(i) The threshold energy for the reaction is the minimum amount of energy required for the reactants to form products.
- It is the energy difference between the energy of the reactants and the energy of the products at the point of reaction. In the given plot, the threshold energy for the reaction is 25 kJ/mol.
(ii) The activation energy for the forward reaction is the energy barrier that must be overcome for the reaction to occur.
- It is the energy difference between the energy of the reactants and the highest point of the energy barrier for the forward reaction. In the given plot, the activation energy for the forward reaction is approximately 70 kJ/mol.
(iii) The activation energy for the backward reaction is the energy barrier that must be overcome for the reaction to proceed in the reverse direction.
- It is the energy difference between the energy of the products and the highest point of the energy barrier for the backward reaction. In the given plot, the activation energy for the backward reaction is approximately 50 kJ/mol.
(iv) The enthalpy change for the forward reaction is the energy difference between the energy of the products and the energy of the reactants.
- In the given plot, the enthalpy change for the forward reaction is approximately -50 kJ/mol. This means that the forward reaction is exothermic, releasing 50 kJ of energy per mole of reactant.
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