1. Log Practice Solve the following practice problems. 1. 218 = 3x
2. ln(3.21/x) =
3. ln(5/7) = x
4. e = x
5. Without calculator: log5 25 = x

2. Rate Law Expt no. [CH3NNCH3]0 Init. Rate 1 .024 6.0 x 10-6
CH3NNCH3 (g) –––> C2H6 (g) + N2 (g)
a. Solve the rate law
b. Calculate the rate constant.
c. What is the rate if the initial concentration is 0.05M
A. Rate = k[CH3NNCH3]
B. k =
C. Rate = k(.05M) = 1.25 x 10-5 Ms-1

3. Comparing Rates
If the initial rate of of consumption of I - is 1.70Ms -1, what is the rate of formation of I3- according to the following reaction?
S2O82-(aq) + 3 I- ––> 2 SO4 2- (aq) + I3- (aq)
What is the rate of production of SO4 2-
R(I3) = 1/3 R(I-) = 5.67 Ms-1
R(SO4) = 2/3 R (I-) = 1.13 Ms-1

4. General Problem 1
The decomposition of gaseous SO2Cl2 into SO2 and Cl2 is first order. The SO2Cl2 concentration decreases from 0.400M to 0.280M in 240s. What is the rate constant for this reaction?
What is the half-life of the reaction?

5. Half Life Problem
At 773K, the rate constant is 6.7 x 10-4 s-1 for the transformation of cyclopropane to propene. What is the half life for cyclopropene at this temperature?

6. General Problem 2 For the first order reaction:
2 N2O5 –––> 4 NO2 + O2
the half life at 298K is 1.87 x 104 s.
If the initial concentration of N2O5 is 2.0 M, what is the the concentration after 3.5 hrs.

7. General Problem 3
The decomposition of NO2 is second order according to the reaction:
2 NO2 (g) –––> 2 NO (g) + O2 (g)
The rate constant for this reaction is 10.2M-1s-1.
If the initial concentration of NO2 is 0.10M, what is the concentration after 15 s?
Brown & LeMay ans. = M