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7. A number of reactions that take place on the surfaces of catalysts are zero order in the reactant. One example is the decomposition of ammonia on hot tungsten. In one experiment, the partial pressure of ammonia decreased from 21 kPa to 10 kPa in 770 s. (a) What is the rate constant for the zero-order reaction

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Answer:

14.29 Pa/s

Explanation:

Given that, for a zero order reaction;

[A] = [A]o - kt

[A] = pressure at time =t

[A]o = initial pressure

k = rate constant

t = time taken

10 * 10^3 Pa  = 21 * 10^3 Pa - 770k

10 * 10^3 Pa - 21 * 10^3 Pa = -770k

-11* 10^3 = -770k

k = -11* 10^3/-770

k = 14.29 Pa/s

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