Answer to Question #145055 in General Chemistry for hunter

Question

4. The mechanism for a reaction is given below.

Step 1: A + 4B --> C Ea 76 kJ/mol
H 30 kJ/mol

Step 2: C + B --> 2E + F Ea 30 kJ/mol
H 20 kJ/mol

Step 3: F + B --> G Ea 10 kJ/mol
H -40 kJ/mol


a) Sketch the potential energy diagram for the rate determining step. Label H, Eaforward, Earev


b) What is the overall equation for this reaction?


c) What is the H(forward) for the overall, or net, reaction?


d) Determine the reaction intermediates for this reaction.


e) Determine the rate law equation that is consistent with the proposed mechanism.


f) A substance is added which will catalyze step 2. What effect will this have on the reaction rate? Explain.


g) For step 2, determine the activation energy for the reverse reaction.

Answer 1

The rate determining step is the slowest step and the one with the highest activation energy

The slowest step is the first step

a. The energy profile of the rate determining step is that of a typical endothermic reaction graph

b. A +6B = 2E + G

c. 10KJ/mol

d. C and F

e. Rate = k [A] [B]⁴

f. It will lower it's activation energy and makes the reaction faster

g. -30KJ/mol