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2. Consider the following reaction mechanism. S+AK1A2dAadK4K3BadBadK5BB+S Where the "Ks" (K1K6) represent rate constants for the various forward (1, 3, and 5) and reverse (2,4, and 6) reactions, and the subscript "ad" represents a species adsorbed on the surface, thus occupying an open surface site (S). a. What type of reaction (Langmuir-Hinshelwood or Rideal-Eley, for example) does this overall reaction represent? Explain your answer, specifically citing the fundamental difference(s) between the reaction types. b. Assuming that the product desorption step is rate-limiting, derive an expression for the overall reaction rate