Hydrogen peroxide decomposes into water and oxygen by the following reaction:H2O2 -> H2O + O2In the presence of hydrogen bromide mechanism changes to: 1) H2O2 + HBr -> HBrO + H2O2) HBrO + H2O2 -> H2O + O2 + HBrExperimental 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 Potential energy2H₂O22H₂O₂ + 2Br +2H+Reaction progress2H₂O2+ O₂2H₂O₂+ O₂ +2Br +2H+

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

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

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

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