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What is the initial concentration of A if the concentration of A is 0.023 M after 48.0 hours?
The reaction A → B follows first-order kinetics with a half-life of 21.7 hours.



A. 0.0050 M
B. 0.051 M
C. 0.51 M
D. 0.11 M
E. 2.0 × 102 M

This question is part of CHEM 2425
Asked by Ochiengj, Last updated: Feb 21, 2020

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1 Answer

John Smith

John Smith

Answered Sep 27, 2016

1. 0.11 M

Solving: t1/2 = 21.7 hr = 0.693/ k k = 0.693/21.7hr ln[A]0/[A] = kt ln[A]0/0.023M = 0.693/21.7hr 48.0hr = 1.533 ln[A]0/0.023M =1.533 [A]0/0.023M=4.63 [A]0 = 4.63 0.023M = 0.11 M

 

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