Consider the following transformation involving first order elementary reaction in each step at constant temperature as shown below. Step 1 Step 2 Step 3 A B C P Some details of the above reaction are

Question

Consider the following transformation involving first order elementary reaction in each step at constant temperature as shown below. Step 1 Step 2 Step 3 A B C P Some details of the above reaction are listed below. Step Rate constant (sec–1) Activation energy (kJ mol–1) k1 2 k2 3 k3 Ea3 If the overall rate constant of the above transformation (k) is given as 2 k k k k and the overall activation energy (Ea) is 400 kJ mol–1, then the value of Ea3 is ______ kJ mol–1 (nearest integer)

Prashant Kotian · Accepted Answer

Correct answer: .. 2 K K K K  a a 2 a a3 E E E RT RT 2 RT E RT A e A e Ae A e      a a a a 2 (E E E ) E 2 RT RT A A Ae e A      2 a a a a E E E E    400 = 300 + 200 – a E a E = 100 kJ/mole

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