ocr: CHAPTER 14 Solutions to Exercises Chemical Kinetics rate == 4t -AS2051 2At ASOTI. AISOCI At -2452051 At (d) At 4sofT = 2(6.1X10-3 M"s")(0.025 M) (0.050 M) = 1.5x10-5 Mis Change of Concentration with Time 14.19 Half-life, tyz is the time required to reduce the concentration of a reaciant to one-haif of its initial value. For first order reactions, tv2 = 0.693/k; the half-life depends only on the rate constant, k, and is independent of reactant concentration. 14.20 For a first order reaction, ty2 depends only on k. Calculate k from Equation 14.9 and then solve fortrz nAt = -kt; [Al = 0.251Alo, t ...
