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Question

A reaction occurs in 3 steps having rate constant K1,K2,K3 the overall rate constant of the reaction 1
K=K1K2K3
The Ea energies of first, second and third steps are 30, 60, 40kJmol1 respectively. Determine activation energy of the reaction.

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Solution

R1=A1eEa1/RT=A1e30KJ/RT
R2=A2eEoRJ/RT
R3=A3e40KJ/RJ
K3=A3e40KJ/RJ
K=K1K2K=A1e30KJ/RT×A2e60KJ/RTA3e40KJ/RT
=(A1A2A3)e50KJ/RT
Enet=50 RJ

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