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- #All India Pre Medical Test
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- #Chemical kinetics
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction of (both of these in kJ/mol). Minimum value of Ea will be:
- Option 1)
Less than
- Option 2)
Equal to
- Option 3)
More than
- Option 4)
Equal to zero
Answers (2)
As we learnt in
Activation Energy -
The minimum kinetic energy that reactants must have in order to form products.
- wherein
Description:
E.g.: In a gas phase reaction numerous collisions take place but only a tiny proportion which has sufficient energy to cross the energy barrier leads to product formation.
As it is clear from the figure lulow, the Ea has to be more than for an endothermic reaction.
In endothermic reactions,, the PE of products is more than that of reactants
Option 1)
Less than
This solution is incorrect
Option 2)
Equal to
This solution is incorrect
Option 3)
More than
This solution is correct
Option 4)
Equal to zero
This solution is incorrect
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Key Idea In endothermic reactions, energy of reactants is less than that of the products. Potential energy diagram for endothermic reactions is where, Ea = activation energy of forward reaction E′a = activation energy of backward reaction ΔH = enthalpy of the reaction. , From the above diagram, Ea=E′a+ΔH Thus, Ea>ΔH .......
So the answer is moe than delta H
