Based on these data, the rate constant for the reaction is _______ M s-1.

Question

The decomposition of hydrogen iodide on a gold surface at 150 °C

HI(g)½ H₂(g) + ½ I₂(g)

is zero order in HI.

In one experiment, when the initial concentration of HI was 8.29×10^-2 M, the concentration of HI dropped to 1.94×10^-2 M after 394seconds had passed.

Based on these data, the rate constant for the reaction is _______ M s^-1.

Answer 1

For a zero order reaction the integrated rate law is

[A] = [A]_o - kt

1.94x10^-2 M = (8.29x10^-2 M) - (394 s)(k)

k = 1.61x10^-4 Ms^-1