A potential energy diagram is shown.
What is the activation energy of this reaction?

Answer:
Ea = 35 kJ.
Explanation:
Activation energy (Ea) is the difference between the potential energy of intermediate "activated complex/ peak" and reactants.
Ea = P.E. of products - P.E. of reactants = 65 kJ - 30 kJ = 35 kJ.
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