Problem: Molecular iodine, I2(g), dissociates into iodine atoms at 625 K with a first-order rate constant of 0.271 s-1 .What is the half-life for this reaction?

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We’re being asked to calculate the half-life (t1/2) of a first-order reaction with a rate constant of 0.271 s–1


Recall that half-life is the time needed for the amount of a reactant to decrease by 50% or one-half. The half-life of a first-order reaction is given by:



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Molecular iodine, I2(g), dissociates into iodine atoms at 625 K with a first-order rate constant of 0.271 s-1 .

What is the half-life for this reaction?

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Based on our data, we think this problem is relevant for Professor Bender's class at LU.