18-10. Decomposition of hydrogen iodide
HI(g) = 1/2 H2(g) 1/2 l2(g)
on a gold surface is a zero-order reaction. In 1.00 s, the concentration of hydrogen iodide decreased from 0.335 M to 0.285 M. Calculate the rate constant and half-life at an initial hydrogen iodide concentration of 0.400 M.

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