GCEChemistryEnergetics and Kinetics2023

Given that the activation energy of a reaction is 80 kJ mol⁻¹ and a catalyst lowers it to 50 kJ mol⁻¹, what is the reduction in activation energy?

A130 kJ mol⁻¹
B30 kJ mol⁻¹CORRECT
C50 kJ mol⁻¹
D80 kJ mol⁻¹
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Why the answer is B, and why the others tempt you.
The reduction in activation energy = 80 − 50 = 30 kJ mol⁻¹. Option A is the sum of both values, option C is the catalysed activation energy, and option D is the uncatalysed activation energy — all common errors.
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