# 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.

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.

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