Problem: A particular reactant decomposes with a half-life of 149 s when its initial concentration is 0.309 M. The same reactant decomposes with a half-life of 243 s when its initial concentration is 0.189 M. Determine the reaction order. What is the value and unit of the rate constant for this reaction?

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A particular reactant decomposes with a half-life of 149 s when its initial concentration is 0.309 M. The same reactant decomposes with a half-life of 243 s when its initial concentration is 0.189 M. 

Determine the reaction order. 

What is the value and unit of the rate constant for this reaction?

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