A number of reactions that take place on the surfaces of cata lysts are zeroth order in the reactant. One example is the decomposition of ammonia on hot tungsten. In one experiment. the partial pressure of ammonia decreased from21 kPa to 10 kPa in 770 s. (a) What is the rate constant for the zeroth-order reaction? (b) How long will it take for all the ammonia to disappear?

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