Determine the reaction order. What is the value and unit of the rate constant fo

Question

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

6.5/100 2/28/2018 10:31 AM Print Calculator und Periodic Table Question 21 of 33 Sapling Learning particular reactant decomposes with a half-life of 141 s when its initial concentration is 0.395 M. The same reactant decompo ses with a half-life of 211 s when its initial concentration is 0.264 M Determine the reaction order What is the value and unit of the rate constant for this reaction? Number Select answer

Explanation / Answer

We know that the half life of a reaction is inversely proportional to (initial concentration)1-n where n is the order of reaction.

thus t1/t2 = [a1/a2]1-n

Substituting the given values

141/211 = [0.395/0.264]1-n

and solving for n , we get n = 2

Thus the order of the reaction is 2.

For a second order reaction, half life t = 1/ka

given t =141s and a = 0.395M

So k = 1/ 0.395M x 141s

=0.01795 M-1s-1

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