Grades for Andrea Brisby: Fi S. University of Oklahoma + O saplingleaming.com/ib

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Grades for Andrea Brisby: Fi S. University of Oklahoma + O saplingleaming.com/ibiscms/mod/ibi5Nie w.php?id-3871 620 Sapling Learning Jump to. Andrea Brisby macmillan learring Question 25 of 28 Available From: Due Date: Points Possible: Grade Category: 11/17/2017 06:00 PM 12/1/2017 11:55 PM 5 Homework 14 1 sapling Learning 15 0 16 1 17 0 18 0 19 0 A reactant decomposes with a half-life of 49.1 s when its initial concentration is 0.151 M. When the initial concentration is 0.238 M, this same reaclant decomposes with a half-life of 77.5 s What is the order of the reaction 5 attempt. 0% penalty. Solutions After Due Date You can check your answers. You can view solutions after the due date You have five attempts per question. There is no penalty for incorrect answers. 20 What is the value and unit of the rate constant for this reaction? 21 eTextbook 22 3 Select answer 23 OHelp With This Topic 24 Web Help & Videos 25 0 26 0 Technical Support and Bug Reports 27 3 100 281100 Previcus Check AnrNeExt Hint © 2011-2017 Sapling Learning, Inc. about u | careers | privacy policy | tams of use | contact us | help 7:13 PM Type here to search

Explanation / Answer

Let 'n' be the order of the reaction.

The relationship between the half life (t1/2) and the concentration (Ao) can be given as

t1/2 is proportional to [Ao]1-n

substituting the two set of given values as per the above relation

77.5 s / 49.1 s = [0.238 M / 0.151 M]1-n

1.578 = [1.576]1-n

correcting to decimal places

1.58 = [1.58]1-n

when n=0 , left hand side = right hand side

so the reaction is of "Zero order"

For a zero order reaction,

t1/2 = [A0]/2k    where k is the rate constant of the reaction.

k = [Ao]/2t1/2 = 0.151 M / (2*49.1 s) = 0.001537 M/s

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