Homework II-1

# Homework II-1 - HOMEWORKII1

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HOMEWORK II-1 22.16b   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 ( k 1 k 2 ). 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  k 1  = 10 s −1  and  k 2  = 1 s −1 . (b) Increase the ratio  k 2 / k 1  steadily by decreasing the value of  k 1  and examine  the plot of [I] against  t  at each turn. What approximation about d[I]/d t  becomes increasingly valid? 23.2b

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## This note was uploaded on 05/01/2011 for the course CHEM 346 taught by Professor Cardelino during the Spring '11 term at Spelman.

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Homework II-1 - HOMEWORKII1

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