Kinetics of Multi-step Reaction Mechanism

Very Hard General Chemistry Chemical Kinetics

A chemical reaction that produces a product through a multi-step mechanism has been proposed. The rate law for the reaction, determined through experiments, is given as: Rate = k[A][B]^2. In this rate law, [A] and [B] are the concentrations of reactants A and B, respectively, and k is the rate constant. The proposed mechanism consists of the following elementary steps:

1. A + B ⇌ C (fast equilibrium)

2. C + B → D (slow, rate-determining step)

The overall reaction is A + 2B → D. Based on the provided rate law, which of the following statements is true regarding the kinetics of this reaction?

The reaction is second-order overall and first-order with respect to A.

The rate does not depend on the concentration of A.

The mechanism indicates that the intermediate C is present in significant amounts during the reaction.

The rate constant k is dependent on the concentration of reactants.

Hint

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