Kinetics

Kinetics Problems:  Rate Versus Concentration

        1. Use the following data to determine the rate law for the reaction between nitrogen dioxide and oxygen
            to form nitrogen dioxide                       2 NO (g)   +   O2 (g)      =   2NO2 (g)


 

Initial Pressure
NO (mm Hg)
 Initial Pressure
O2 (mm Hg)
Initial Rate of  
Reaction (mm Hg/s)
100
100
0.355
150
100
0.800
250
100
2.22
150
130
1.04
150
180
1.44

 


2. Use the results of the proceeding problem to determine the rate constant for this reaction.
     Predict the initial rate of reaction when the initial pressures of NO and O2 are 250 mm Hg.


3. Use the following data to determine the rate law fro the reaction between methyl iodide and
     the OH- ion in aqueous solution to form methanol and the iodide ion.

 

Initial (CH3I) (M)
Initial (OH-) (M)
Initial Rate of
Reaction (M/s)
1.35
0.10
8.78 E-6
1.00
0.10
6.50E-6
0.85
0.10
5.53E-6
0.85
0.15
8.29 E-6
0.85
0.25
1.38 E-5

 



4. Use the resultsof the preceding question to determine the rate constant for this reaction.  Predict     the initial instantaeous rate of reaction when the initial CH3I concentration is 0.10 M and the initial     OH- concentration is 0.050 M.

        Kinetics Problems:  Concentration as a function of time

 

            5. 

Time, sec

Molar Concentration

0

0.10

80

0.086

120

0.079

160

0.075

240

0.066

320

0.059

480

0.049



 

            6.

 

Time, sec
Molar concentration
0
0.10
24
0.088
48
0.077
72
0.068
96
0.060
120
0.052
144
0.046


        7.

 

Time
Molar Concentration
195
0.016
604
0.015
1246
0.013
2180
0.011
6210
0.0068



updated December 31, 2007