A reaction has a rate constant o 1.28x10-4 s 1 at 29 o C and 0.229 s 1 at 77 o C

Question

A reaction has a rate constant o 1.28x10-4 s 1 at 29 o C and 0.229 s 1 at 77 o C You may want to reference (D pages 615-622) section 13.5 while completing this problem Ea 137 kJ/mo Submit My Answers Give Up Correct The activation energy Ea s an energy barrier or hump that must be surmounted for the reactants to be transformed into products. The activation energy was found using the following equation In (a) (t h) (ii) R ln 8.314 un 0.229 s -1 mol-K 1.28x10-1 s-1 1 kJ 1000 J 0 K Ea 137 mol significant Figures Feedback: Your answer 137.25 kJ/mol was either rounded differently or used a different number of significant figures than required for this part. Part B What is the value of the rate constant at 15 C Express your answer in units of inverse seconds. Submit My Answers Give U

Explanation / Answer

logK2/K1   = Ea/2.303R [1/T1 -1/T2]

   T2           = 15C0   = 15+273 = 288K

   T1            = 29C0   = 29+273 = 302K

logK2/1.28*10-4    = 137000/2.303*8.314 [1/302 -1/288]

logK2/1.28*10-4     = 7155.11 [0.00331-0.00347]

logK2/1.28*10-4    = 7155.11*-0.00016

logK2/1.28*10-4   = -1.1448

K2/1.28*10-4         = 10-1.1448

K2/1.28*10-4        = 0.0716

K2                     = 0.0716*1.28*10-4

K2                         = 9.16*10-6 sec-1    >>>>> answer

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