Question

#13 Interpreting Mechanisms

1. Consider the following mechanism:

Step 1      Br₂                                                   2Br                 fast

Step 2      Br     +     H₂                                    H₂Br                fast

Step 3     H₂Br    +     Br                                  2HBr                slow

a. What is the overall equation?

b. Identify the intermediate(s) if any.

c. What is the molecularity and the rate law for each step including any reversible steps?

d. What is the predicted rate law expression for this reaction. Be sure to only list reactants from the overall equation and not intermediates in the rate law expression.

2. Consider this two step mechanism for a reaction…

Step 1     NO₂     +     O₃                       NO₃     +     O₂ slow; rate determining step

Step 2     NO₃     +     NO₂                   N₂O₅                                          fast

a. What is the overall reaction?

b. Identify the intermediates in the mechanism.

c. Write the rate law expression for each step of the mechanism including any reversible reactions.

c. What is the predicted rate law expression? Be sure to only list reactants from the overall equation and not intermediates in the rate law expression.

3. A proposed mechanism for the decomposition of ozone, O₃, is as follows:

Step 1                          O₃                        O₂     +      O fast

Step 2     O₃     +     O                          2O₂                  slow

a. What is the overall reaction?

b. Identify the intermediates in the reaction mechanism.

c. Write a rate law expression for each step including any reversible reactions.

d. What is the predicted rate law expression? Be sure to only list reactants from the overall equation and not intermediates in the rate law expression.

4. Consider the following 3 step reaction mechanism:

Step 1                       H₂                                    2H                         fast

Step 2         H     +     CO                           HCO        slow

Step 3         H     +     HCO                        H₂CO       fast

a. What is the overall reaction?

b. Identify the intermediates in the reaction mechanism.

c. Write a rate law expression for each step of the mechanism including any reversible reactions.

c. What is the predicted rate law expression? Be sure to only list reactants from the overall equation and not intermediates in the rate law expression.

Answer 1

I have solved it for part 1. Kindly do similarly for the rest of the questions. Arrows and rate constants are not provided in the question. If the reaction is in equillibrium or not, I am not able to make it out. I will be able to give full justice to the solution if you provide me the full data. Thank you.