Chapter 12: Chemical Kinetics 12.1Initial rate data for the reaction 2N2O5 (g) ⇔ NO2 (g) + O2 (g) are given in Table What is the rate law for this reaction? 12.2 The half-life for the radioactive decay of 32P is 14.2 days How many days would be required for a sample of a radiopharmaceutical containing 32P to decrease to 20% of its initial activity? 12.3 When the reaction CH3Cl(g) + H2O(g) ⇔ CH3OH (g) + HCl (g) Was studied, the tabulated date were obtained Based on these data, what are the reaction order? 12.4 The Williamson synthesis is a major means to producing organic ethers from alkyl halides The following Williamson synthesis at 25°C produced the rate data below: Use the data to determine the rate law for the reaction and the rate constant (k) : Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 - Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam Email: nguyentienthao@gmail.com 12.5 The decomposition of hydrogen peroxide is a useful way to obtain oxygen: 2H2O2 (l)  2H2O (l) + O2 (g) a/It is a first order reaction with a rate constant of 0.0410 min-1 b/If we start with a 3.00% hydrogen peroxide solution (a typical solution sold in grocery stores), what will be its concentration after 30.0 minutes? c/How long will it take for its concentration to drop to 2.00%? How long will it take for one-half of the sample to decompose? 12.6 The reaction: 2NOCl(g)  2NO (g) + Cl2 (g) has an activation energy, Ea of 1.00 x102 kJ/mol, and a rate constant of 0.286 s-1 at 500K What is the rate constant at 400K? 12 Acetaldehyde, CH3CHO, decomposes into methane gas and carbon monoxide gas This is a second-order reaction The rate of decomposition at 140°C is 0.10 mole/liter.sec when the concentration of acetaldehyde is 0.010 mole/liter What is the rate of the reaction when the concentration of acetaldehyde is 0.50 mole/liter? Additional problems: Chapter 12: 19, 21, 23, 25, 27, 29, 31, 3, 35, 37, 39, 41, 43, 45, 47, 49, 51,53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81 Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU 19 - Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam Email: nguyentienthao@gmail.com