HOMEWORK II-122.16b The effective rate constant for a gaseous reaction that has a Lindemann–Hinshelwood mechanism is 1.7 ×10−3 s−1 at 1.09 kPa and 2.2 × 10−4 s−1 at 25 Pa. Calculate the rate constant for the activation step in the mechanism.22.12 Use mathematical software or an electronic spreadsheet to examine the time dependence of [I] in the reaction mechanism A → I → P (k1, k2). You may either integrate eqn 22.39 numerically (see Appendix 2) or use eqn 22.40 directly. In all the following calculations, use [A]0 = 1 mol dm−3 and a time range of 0 to 5 s. (a) Plot [I] against t for k1 = 10 s−1 and k2 = 1 s−1. (b) Increase the ratio k2/k1 steadily by decreasing the value of k1 and examine the plot of [I] against t at each turn. What approximation about d[I]/dt becomes increasingly valid?
This is the end of the preview.
access the rest of the document.