For two parallel first-order reactions, what is the overall activation energy of reaction? The yields of B and C in products are 40% and 60%, respectively. A → B (Ea = 20 kcal/mol); A → C (Ea = 40 kca

Question

For two parallel first-order reactions, what is the overall activation energy of reaction? The yields of B and C in products are 40% and 60%, respectively. A → B (Ea = 20 kcal/mol); A → C (Ea = 40 kcal/mol)

Prashant Kotian · Accepted Answer

Correct answer: B. Overall activation energy is the yield-weighted average of the individual activation energies. Overall Ea = (0.40 × 20) + (0.60 × 40) = 8 + 24 = 32 kcal/mol. Therefore, correct answer is B.

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