The reaction described by H2(g)+I2(g)⟶2HI(g) has an experimentally determined rate law of rate=k[H2][I2] Some proposed mechanisms for this reaction are: Mechanism A (1) H2(g)+I2(g)−→k12HI(g) (one-step reaction) Mechanism B (1) I2(g)⥫⥬=k−1k12I(g) (fast, equilibrium) (2) H2(g)+2I(g)−→k22HI(g) (slow) Mechanism C (1) I2(g)⥫⥬=k−1k12I(g) (fast, equilibrium) (2) I(g)+H2(g)−→k2HI(g)+H(g) (slow) (3) H(g)+I(g)−→k3HI(g) (fast) Which of these mechanisms are consistent with the observed rate law? mechanism C mechanism B mechanism A In 1967, J. H. Sullivan showed that this reaction was dramatically catalyzed by light when the energy of the light was sufficient to break the I−I bond in an I2 molecule. Which mechanism or mechanisms are consistent with both the rate law and this additional observation? mechanism A mechanism B mechanism C
Solved
Show answers
More tips
- H Health and Medicine How does childbirth happen: everything future mothers need to know...
- H Health and Medicine What Are the Best Vitamins? A Scientific View on Vitamin Supplements...
- A Auto and Moto How to Deregister a Car in Moscow?...
- A Auto and Moto What Is the Cost of Customs Clearance for a Car in Russia?...
- A Auto and Moto How to choose the right drive for your BMW...
- H Health and Medicine 10 Tips for Avoiding Vitamin Deficiency...
- L Leisure and Entertainment Mysteries of the Name Vyacheslav Dobrynin...
- H Health and Medicine What makes Graves’ disease dangerous?...
- F Food and Cooking When is Easter in 2011?...
- C Computers and Internet Best Antivirus: How to Choose Protection for Your Computer?...
Answers on questions: Chemistry
- C Chemistry 2. Herbivores get energy by eating plants. Plants get energy from sunlight. Why does most of the energy captured by plants never become available to herbivores? a. The herbivorės...
- E English PLEASE HELP ME Choose one of the other readings from the unit (“The Harvest,” “I Explain a Few Things,” “The Space,” or “My Aunt Gold Teeth”) and describe how culture and/or setting...
- E English This is the part of the plot line/diagram where the setting, characters, and main idea are introduced. a. climax b. resolution c. exposition d. conflict...
Ответ:
The only mechanism consistent with observed rate law is mechanism A.
Mechanism A is the only consistent with the observation of J. H. Sullivan
Explanation:
In a reaction, rate law is determined by slow step of the reaction.
In mechanism A, rate law is:
rate = k₁ [H₂][I₂]
In mechanism B, rate law is:
rate = k₂ [H₂][I]²
In mechanism C, rate law is:
rate = k₂ [H₂][I]
Thus, the only mechanism consistent with observed rate law is mechanism A
Now, catalyst works in the slow-step of reaction, is the reaction is catalyzed when The I-I bond breaks, the mechanism consistent with the observation is the mechanism where the slow-step of reaction involves this bond break, again, mechanism A is the only consistent with the observation of J. H. Sullivan.
Ответ: