Question

The activation energy of an endothermic reaction _____.

must be greater than the required ΔH
must be less than the required ΔH
must be equal to the required ΔH
is not needed for the required ΔH

Answer 1

I think the correct answer would be the third option. The activation energy of an endothermic reaction should be equal to the required ΔH. The activation energy is the energy needed to be achieved or reached in order for a reaction to occur. So, enthalpy change should be equal or greater than that of the activation energy.

Answer 2

must be greater than the required ΔH

Step-by-step explanation:

The activation energy is the minimum extra amount of energy required by reactant molecules to undergo a reaction.

For both exothermic and endothermic reactions we need activation energy.

Enthalpy is the energy difference between products and reactants.

For endothermic reactions, enthalpy is positive as the energy of products is more than the energy of reactants.

As activation energy will be greater than the energy of both the reactants and products, so it must be greater than the enthalpy of reaction.