Set up the rate expressions for the following mechanism. A --> B k1 B --> A k2 B

Question

Set up the rate expressions for the following mechanism. A --> B k1 B --> A k2 B+C --> D k3 If the concentration of B is small compared with the concentrations of A, C, and D, the steady-state approximation may be used to derive the rate law. Derive the rate law, and show that this reaction may follow the first-order equation at high pressures and the second-order equation at low pressures.

Explanation / Answer

Rate law: A-->B.....k1 B+C--->D....k3 =>A+C--->D...k1.k3 At low pressure steady state is not achieved and products are B and D..So second order At high pressure steady state is achieved and product is only D..So first order

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