21. Questions 21-23 refer to the following information. The following is the mec

Question

21. Questions 21-23 refer to the following information. The following is the mechanism and reaction energy profile for the reaction represented above. Step 1: Bn 2Br reversible Step 2: Br + H2 HBr + H Step 3: H + Br HBr On the basis of the energy diagram, which step is the slowest step in the mechanism? (A) Step 1 (B) Step 2 (C) Step 3 (D) The slowest step cannot be found using the energy diagram alone. 22. If this reaction were run at a higher temperature, which statement concerning the change in rate for the steps in this reaction would be true? (A) Only step 1 would increase its rate because it is a reversible reaction. (B) Only step 2 would increase its rate because it has the highest activation energy. (C) Only step 3 would increase its rate because it is the final step in the reaction pathway. (D) All three steps would have an increase in reaction rate because the change in rate for the rate dependent step will cause all the other steps' rate to change. 23. Which of the following statements is true regarding the reaction for the formation of HBr? (A) Step I represents a bimolecular reaction. (B) An increase in concentration of H2 will decrease the overall rate of the reaction. (C) Raising the temperature will have no effect on the numerical value of the rate constant. (D) The rate law that is consistent with the mechanism is rate- k [H2llBr2]12

Explanation / Answer

Answer 21. (B) Step 2 is the slowest.

Step 2 is the rate law determing step as it is the slowest among all the steps.

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