For a set of parallel first-order reactions (, ) and (, ), the overall effective activation energy for the destruction of A is expressed by which formula?

Question

For a set of parallel first-order reactions $A \rightarrow B$ ($k_1$, $E_{a1}$) and $A \rightarrow C$ ($k_2$, $E_{a2}$), the overall effective activation energy $E_{a(eff)}$ for the destruction of A is expressed by which formula?

Prashant Kotian · Accepted Answer

Correct answer: B. Taking the Arrhenius derivative of the overall rate constant mathematically yields a weighted average of the activation energies, explicitly defined as .

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