kinetics                        test                                           50 points                                                          chemistry
           
Show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

1.  In regards to the reaction:  C2H6  +  O2  à  CO2  + H2O, fill-in the below table; need not show work in this problem.  [16 points]

Rate (mM / sec)

Δ [C2H6] / Δt  (mM / sec)

Δ [O2] / Δt  (mM / sec)

Δ [CO2] / Δt  (mM / sec)

Δ [H2O] / Δt  (mM / sec)

2.0

 

 

 

 

 

 

 

20.0

 

2.  Based upon the below hypothetical experimental data, determine the rate law of the reaction:  N2  +  H2 →   NH3; include the value / units of the rate constant.  [15 points]

Expt

Rate (mM / sec)

[N2]  (M)

[H2]  (M)

1

2.0

1.0

1.0

2

4.0

2.0

1.0

3

4.0

1.0

4.0

3. In regards to the reaction:  N2  +  H2 →  NH3,  [10 points]

a. sketch / label the reaction energy profile

b. what is the value of the activation energy of the forward reaction, if the activation energy of the backward reaction is 125 kJ ? 

4. In regards to a catalyst,   [9 points]

a.  What is the effect of a catalyst on the rate of the forward and backward reaction ? 

b.  Sketch / label the reaction energy profile to illustrate the effect of a catalyst on a reaction.