JEE Main 2024 Chemistry question
For a reaction taking place in three steps at same temperature, overall rate constant . If Ea₁, Ea₂ and Ea₃ are 40, 50 and 60 kJ/mol respectively, the overall Ea is kJ/mol.
Answer: 30
Solution
Using the Arrhenius equation K = Ae^(−Ea/RT) for each step, K = K₁K₂/K₃ gives Ea = Ea₁ + Ea₂ − Ea₃ = 40 + 50 − 60 = 30 kJ/mol.