Potential energy 2H₂O2 2H₂O₂ + 2Br +2H+ Reaction progress 2H₂O2+ O2 2H₂O2+ O₂ + 2Br +2H+

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Hydrogen peroxide decomposes into water and oxygen by the following reaction:

H2O2  -> H2O + O2

In the presence of hydrogen bromide mechanism changes to:

 1) H2O2 + HBr -> HBrO + H2O
2) HBrO + H2O2 -> H2O + O2 + HBr

Experimental evidence tells us that this reaction is first order with respect to hydrogen peroxide with ΔHrxn = -94.64 kJ/mol. Consider the reaction energy diagram and answer the following questions :

  1. How many elementary steps are in the uncatalyzed reaction?    
  2. How many elementary steps are in the catalyzed reaction?   
  3.  Which step in the catalyzed mechanism is endothermic (first or second)?  
  4.  Which step is rate-limiting (first or second)?    
  5. Estimate the Eact (kJ) for the rate-determining step    
  6. Give the formula and the name of the reaction intermediate    

 

Potential energy
2H₂O2
2H₂O₂ + 2Br +2H+
Reaction progress
2H₂O2+ O₂
2H₂O₂+ O₂ +
2Br +2H+
Transcribed Image Text:Potential energy 2H₂O2 2H₂O₂ + 2Br +2H+ Reaction progress 2H₂O2+ O₂ 2H₂O₂+ O₂ + 2Br +2H+
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