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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 containi

Chapter 12: Chemical Kinetics

12.1Initial rate data for the reaction

2N2O5 (g) ⇔ 4 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) :

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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 7 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

19 - Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam Email: nguyentienthao@gmail.com 2