Question

For an endothermic reaction, energy of activation is Eₐ and
enthalpy of reaction of ∆H (both of these in kJ/mol). Minimum
value of Eₐ will be.
(a) less than ∆H (b) equal to ∆H
(c) more than ∆H (d) equal to zero

Answer 1

The Minimum  value of Eₐ will be equal to △H.

Option (B) is correct.

Explanation:

• Plot of energy v/s reaction progress for a typical endothermic reaction.
• Energy is taken on y- axis and progress on x-axis.
• The minimum value of the activation energy is the difference between the energy content of reactant and product.
• ΔH also gives the difference between the reactant and product.
• The minimum value for the activation energy will be equal to △H.

Thus the Minimum  value of Eₐ will be equal to △H.

Also learn more

He activation energy for the reaction, 2 hi(g) -> H2+i2 (g) is 209.5 k j mol-1 at 581 k.Calculate the fraction of molecules of reactants having energy equal to or greater than activation energy?

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