<p>Hmmm...</p>
<p>I really should know how to do this, but I forgot.</p>
<p>Calculate the rate constant of a first order reaction if the initial concentration of a reactant is 0.373 M and the concentration of reactant after 122 s is 0.0974 M.</p>
<p>Help would be GREATLY appreciated.</p>
<p>(0.373 M - 0.0974 M) / 122s = 0.00226 M/s</p>
<p>im not 100% sure, but i believe the above post is incorrect. although the above poster did solve for the rate, he or she did not solve for the rate constant. the equation is: ln[A]after time t/ ln [A] initial = -kt. plugging in values for the initial and final concentrations and 122 for time you should find the rate constant</p>