A particular reactant decomposes with a half‑life of 155 s155 s when its initial concentration is 0.396 M.0.396 M. The same reactant decomposes with a half‑life of 215 s215 s when its initial concentration is 0.285 M.0.285 M. Determine the reaction order. 1 2 0   What is the value and units of the rate constant for this reaction?

Q: [HI] (M) 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 4

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