EBK ESSENTIAL ORGANIC CHEMISTRY
EBK ESSENTIAL ORGANIC CHEMISTRY
3rd Edition
ISBN: 9780100659469
Author: Bruice
Publisher: YUZU
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Chapter 5.7, Problem 16P

(a)

Interpretation Introduction

Interpretation:

A reaction coordinate diagram for the reaction in which the product is thermodynamically stable and kinetically unstable should be drawn.

Concept introduction:

  • Thermodynamic stability can be represented as ΔG0.  Depend upon the value of ΔG0 it is possible to find stability of the product compared with the reactant.
  • If ΔG0 is negative, then the product is thermodynamically stable compared with the reactant.
  • If ΔG0 is positive, then the product is thermodynamically unstable compared with the reactant
  • In an exergonic reaction the products have a lower free energy than it consumes.
  • In an endergonic reaction the product have a higher free energy than it consumes.
  • Kinetic stability can be represented as ΔG.  Depend upon the value of ΔG it is possible to find stability of the product compared with the reactant.
  • If ΔG is large, then the reactant is kinetically stable because it reacts slowly.
  • If ΔG is small, then the reactant is kinetically unstable because it reacts rapidly.
  • If ΔG for the reverse reaction is large then he product is kinetically stable, similarly if it is small then the product is kinetically unstable.
  • Reaction coordinate diagram shows how the energy of the system changes during a chemical reaction.

(b)

Interpretation Introduction

Interpretation:

A reaction coordinate diagram for the reaction in which the product is thermodynamically unstable and kinetically stable should be drawn.

Concept introduction:

  • Thermodynamic stability can be represented as ΔG0.  Depend upon the value of ΔG0 it is possible to find stability of the product compared with the reactant.
  • If ΔG0 is negative, then the product is thermodynamically stable compared with the reactant.
  • If ΔG0 is positive, then the product is thermodynamically unstable compared with the reactant.
  • In an exergonic reaction the products have a lower free energy than it consumes.
  • In an endergonic reaction the product have a higher free energy than it consumes.
  • Kinetic stability can be represented as ΔG.  Depend upon the value of ΔG it is possible to find stability of the product compared with the reactant.
  • If ΔG is large, then the reactant is kinetically stable because it reacts slowly.
  • If ΔG is small, then the reactant is kinetically unstable because it reacts rapidly.
  • If ΔG for the reverse reaction is large then he product is kinetically stable, similarly if it is small then the product is kinetically unstable.
  • Reaction coordinate diagram shows how the energy of the system changes during a chemical reaction.

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Instructions: Complete the questions in the space provided. Show all your work 1. You are trying to determine the rate law expression for a reaction that you are completing at 25°C. You measure the initial reaction rate and the starting concentrations of the reactions for 4 trials. BrO³¯ (aq) + 5Br¯ (aq) + 6H* (aq) → 3Br₂ (l) + 3H2O (l) Initial rate Trial [BrO3] [H*] [Br] (mol/L) (mol/L) | (mol/L) (mol/L.s) 1 0.10 0.10 0.10 8.0 2 0.20 0.10 0.10 16 3 0.10 0.20 0.10 16 4 0.10 0.10 0.20 32 a. Based on the above data what is the rate law expression? b. Solve for the value of k (make sure to include proper units) 2. The proposed reaction mechanism is as follows: i. ii. BrО¸¯ (aq) + H+ (aq) → HBrO3 (aq) HBrO³ (aq) + H* (aq) → H₂BrO3* (aq) iii. H₂BrO³* (aq) + Br¯ (aq) → Br₂O₂ (aq) + H2O (l) [Fast] [Medium] [Slow] iv. Br₂O₂ (aq) + 4H*(aq) + 4Br‍(aq) → 3Br₂ (l) + H2O (l) [Fast] Evaluate the validity of this proposed reaction. Justify your answer.

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