Chem12 Professor Arnold

Kinetics Problem Sheet


1. The homogeneous gas-phase reaction, 2 A + 2 B --> C + 2 D, was studied and the following data were obtained.

Experiment(A)°(B)°Rate (mole/L s)
10.7500.5603.15E-4
20.2220.5602.76E-5
30.9200.7504.74E-4

a. Determine the rate law for this reaction.
b. Determine the value of the specific rate constant.

2. Consider the homogeneous gas-phase reaction, A --> B + C, which is first order in A and which has a half-life of 66 seconds. How long would it take for 65 % of A to decompose?


3. The reaction, 2 NOCl (g) --> 2 NO (g) + Cl2 (g), has a specific rate constant of 9.3E-6 s-1 at 77°C and a specific rate constant of 6.9E-4 s-1 at 127°C.

a. Calculate the activation energy for this reaction.
b. At what temperature would the specific rate constant for this reaction be equal to 1.0E-7 ?

4. The homogeneous gas-phase reaction, 3 A --> B + C, was studied and the following data were obtained starting with pure A at time zero.

Time (s)Total Pressure (atm)
02.0000
101.9782
201.9570
301.9570
401.9169

a. Calculate the average rate of the reaction over the first 20 seconds of the reaction.
b. Calcuate the average rate of disappearance of A over the first 20 seconds of the reaction.
Dr. Merle Arnold | Physical Science Department | Santa Monica College | last updated 8/12/01