Answer: Many reactions involving heterogeneous catalysts
Chapter 13, Problem 13.109(choose chapter or problem)
Many reactions involving heterogeneous catalysts are zero order; that is, rate 5 k. An example is the decomposition of phosphine (PH3) over tungsten (W): 4PH3(g) P4(g) 1 6H2(g) It is found that the reaction is independent of [PH3] as long as phosphines pressure is sufficiently high ($ 1 atm). Explain.
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