|CHM112 Home Page||Reference Materials||Homework Assignments||Lectures||Exams & Quizzes||Grades||Study Aids||URI Home Page|
A first order reaction, A products, has a rate of reaction of 0.00250 M s1 when [A] = 0.484 M. (a) What is the rate constant, k, for this reaction? (b) Does t3/4 depend on the initial concentration? Does t4/5? Explain.
(a) For a first order reaction, Rate = k[A]. Since the rate and concentration
are known, solving the equation for k gives the required answer.
k = Rate/[A] = 0.00250 M s1/0.0484 M = 5.17 × 103 s1.
(b) Neither t3/4 nor t4/5 depend upon intial concentration because this is a first order reaction, which means that the time associated reaction is simply related to the rate constant.