Jump to... 2/15/2018 08:00 AM 17.2/202/8/2018 05:16 PM Gradeb -Print Calculator

Question

Jump to... 2/15/2018 08:00 AM 17.2/202/8/2018 05:16 PM Gradeb -Print Calculator Periodic Table Question 10 of 15 Mapd Sapling Learning A reactant decomposes with a half-life of 129 s when its initial concentration is 0.357 M. When the initial concentration is 0.549 M, this same reactant decomposes with the same half-life of 129 s What is the order of the reaction? What is the value and unit of the rate constant for this reaction? Number Select answer M st 1 O Previous G've Mp & View Solution e> Check Answer 0 Next Exit

Explanation / Answer

(t1/2)1/(t1/2)2   = (a2/a1)^n-1

a1                 = 0.357M

(t1/2)1          = 129sec

   a2               = 0.549M

( t1/2)2        = 129sec

(t1/2)1/(t1/2)2   = (a2/a1)^n-1

   129/129        = (0.549/0.357)^n-1

   1                = (1.5378)^n-1

(1.5378)^0    = (1.5378)^n-1

n-1   = 0

   n = 1

order is 1

Rate = k[A]

M/sec   = K *M

K     = sce^-1

The first order rate constant units   sec^-1

   

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