help please! MasteringChemistry Ch 14 Post Lecture Google Chrome à Secure https:

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help please!

MasteringChemistry Ch 14 Post Lecture Google Chrome à Secure https://session.masteringchemistry.com/myct/itemView?offset-nextBassignmentProblemiD 99062381 Ch 14 Post Lecture Problem 14.48 Part A Consiter the data presented below Determine whether the reactiontrst order or becond ordm Tine (s) |40 |80 |120 |100 Meles or A o 100 0.07 0045 0.030 0 000 This the first order reaction. This is the second rder reacon Submit Part 8 This question will be shown after you complete previous questions) Part C What is the ha-ite? Submit

Explanation / Answer

Part A) This is first order reaction

from the data :

first let us check for first order :

k1 = 1/t ln (Ao / At)

     = 1/40 ln (0.1 / 0.067)

    = 0.0100

k2 = 1/80 ln (0.1 / 0.045)

    = 0.0100

k3 = 1/120 ln (0.1 / 0.03)

    = 0.0100

here all rate constants are same. so this is confirmed to first order.

part B)

rate constant = 0.693 / t1/2

t1/2 = 0.693 / 0.0100

       = 69.2 s

half - life = 69.2 s

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