February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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15CatalysisHard1 mark
A reversible chemical reaction is studied. The forward reaction has an activation energy kJ mol and an enthalpy change of reaction kJ mol. When a catalyst is added, the activation energy of the forward reaction decreases by 50%. What is the activation energy of the backwards reaction when the catalyst is present?