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The reaction between A and B involves an intermediate I whose concentration remains very low through โ€” Kinetics Chemistry Question

Question

The reaction between A and B involves an intermediate I whose concentration remains very low throughout the reaction. The initial rates of a reaction as a function of [B] (at constant [A]) are shown below. Which statement about the mechanism is most consistent with the data?

A.

A initially reacts reversibly to form the intermediate I, which then reacts irreversibly with B in a process that is first-order in B.

โœ“ Correct
B.

A initially reacts reversibly to form the intermediate I, which then reacts irreversibly with B in a process that is second-order in B.

C.

B initially reacts reversibly in a first-order process to form the intermediate I, which then reacts irreversibly with A.

D.

B initially reacts reversibly in a second-order process to form the intermediate I, which then reacts irreversibly with A.

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