Bài tập hoá vô cơ: động lực hoá học

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) :

Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU
19 - Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam. Email:

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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

Nguyen Tien Thao, Faculty of Chemistry, Hanoi College of Science, VNU
19 - Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam. Email:

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