Typing Spanish Accents x Univ. of South Mississ x C The Rate Constant For T x C
ID: 524863 • Letter: T
Question
Typing Spanish Accents x Univ. of South Mississ x C The Rate Constant For T x C www.sap nglea ning.com/ibiscms/m 3578767 /mod/ibis/view.php?id: My Assignment 5/5/2017 05:00 PM A 67.8/100 O 5/4/2017 10:15 AM Gradebook Attempts Score Print Calculator Periodic Table Question 12 of 29 Map Sapling Learning After 71.0 min, 24.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics? Number Tools 12 0 98 Previous 2 check Answer Next Exi O Resources Assignment Information Available From: 4/15/2017 08:00 AM 5/5/2017 05:00 PM Due Date: Points Possible Grade Category: Extra Credit Description: Policies Extra credit You can check your answers. You can view so tions after the due d You can keep trying to answer each question until you get it right or give up. You lose 5% of the points available to each answer in your question for each incorrect attempt at that Textbook o Help with This Topic OWeb Help & Videos OTechnical Support and Bug ReportsExplanation / Answer
24 % of compound has decomposed means 76 % is still remain ing
So,
if [A]o = 100
[A] = 76
use integrated rate law for 1st order reaction
ln[[A]] = ln[[A]]o - k*t
ln(76) = ln(100) - k*71
4.33 = 4.61 - k*71
k*71 = 0.27
k = 3.865*10^-3 min-1
Given:
rate constant, k = 3.865*10^-3 min-1
use relation between rate constant and half life of 1st order reaction
t1/2 = (ln 2) / k = 0.693/(k)
= 0.693/(3.865*10^-3)
= 1.79*10^2 min
Answer: 1.79*10^2 min
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