Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter1: Introduction To Chemistry
Section: Chapter Questions
Problem 1.77PAE
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Question
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 :
- How many elementary steps are in the uncatalyzed reaction?
- How many elementary steps are in the catalyzed reaction?
- Which step in the catalyzed mechanism is endothermic (first or second)?
- Which step is rate-limiting (first or second)?
- Estimate the Eact (kJ) for the rate-determining step
- Give the formula and the name of the reaction intermediate
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