Many reactions involving heterogeneous catalysts are

Chapter 14, Problem 114AP

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Many reactions involving heterogeneous catalysts are zeroth order; that is, rate = k. An example is the decomposition of phosphine \(\left(\mathrm{PH}_{3}\right)\) over tungsten (W):

\(4 \mathrm{PH}_{3}(g) \longrightarrow \mathrm{P}_{4}(g)+6 \mathrm{H}_{2}(g)\)

It is found that the reaction is independent of \(\left[\mathrm{PH}_{3}\right]\) as long as phosphine’s pressure is sufficiently high \((\geq 1 \mathrm{~atm})\). Explain.

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