Chemical Kinetics Practice Problems
1. Balance the equation below and determine the rate expression using the given data. Find k with units.
N2 + H2 ---> NH3 (all gaseous)
|
[N2] (M) |
[H2] (M) |
Initial Rate (M/min) |
|
0.10 |
0.10 |
0.0021 |
|
0.10 |
0.20 |
0.0084 |
|
0.20 |
0.40 |
0.0672 |
2. The decomposition of NOCl to NO and Cl2 has k = 9.3x10-5 1/M•s at 100°C and
k = 1.0x10-3 1/M•s at 130°C. What is the activation energy of this reaction?
3. The halogen astatine can only be obtained artificially through bombardment. It has been found to be useful for the treatment of certain types of cancer of the thyroid gland. One form of radioactive astatine is an a particle emitter with a half-life of 7.21 hr. If a sample containing 0.100 mg of astatine is given to a person at 9 a.m. one morning, how much astatine will remain after about 14 hours?
4. It took 143. seconds for 50.0% of a substance to decompose. If the initial concentration was 0.060 M and the reaction is first order, what is the value of the rate constant with units?