Question

A catalyst decreases the activation energy of a particular exothermic reaction by 58 kJ/mol, to 24...

A catalyst decreases the activation energy of a particular exothermic reaction by 58 kJ/mol, to 24 kJ/mol. Assuming that the mechanism has only one step, and that the products are 89 kJ lower in energy than the reactants, sketch approximate energy-level diagrams for the catalyzed and uncatalyzed reactions.

What is the activation energy for the uncatalyzed reverse reaction? (Please Show Work)

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Answer #1

Graph 1 depicts unanalysed reaction and graph 2 is for canalized reaction.

Activation energy in the absence of catalyst will be = 58 +24 = 82KJ/mol

Activation energy of Products in the absence of catalyst in backward reaction = 89KJ+82KJ= 171KJ/mol (refer image 1)

Activation energy is reduced in presence of catalyst which is given as 24KJ/mol

Activation energy of Products in the presence of catalyst in backward reaction = 24KJ+89KJ =113KJ/mol (refer image 2)

Activation energy of uncatalysed reverse reaction is 171KJ/mol

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