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Chapter 6: Problem 6.20 (page 233)

Draw an energy diagram for a two-step reaction, A鈫�B鈫�C, where the relative energy of these compounds is C<A<B, and the conversion of B鈫�Cis rate-determining.

Short Answer

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Answer

The energy diagram is as follows:

Step by step solution

01

Step-by-Step SolutionStep 1: Energy diagram

An energy diagram (energy vs. reaction coordinate) is used to describe the change in energy of a system during the conversion of the reactants to the products.

02

Rate determining step

The step (in a chemical reaction) that takes the maximum time in the conversion of the reactants to products is termed the rate-determining step.

The rate-determining step has the maximum activation energy barrier.

03

Energy diagram of the given reaction

The reaction involves the transformation of the reactant A to product C through an intermediate B.

Species C has the lowest energy, and B has the highest energy.

Since it is given that the conversion of B to C is the rate-determining step, the activation energy barrier between B and C will be the maximum.

Energy diagram of a two-step reaction

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Most popular questions from this chapter

a. Which value corresponds to a negative value of 鈭�G掳:Keq=10-2or Keq=102?

b. In a unimolecular reaction with five times as much starting material as product at equilibrium, what is the value of Keq? Is 鈭�G掳positive or negative?

c. Which value corresponds to a larger Keq: 鈭�G掳=-8kJ/molor 鈭�G掳=20kJ/mol?

Calculate 螖贬掳 for each oxidation reaction. Each equation is balanced as written; remember to take into account the coefficients in determining the number of bonds broken or formed.

[ 螖贬鈭�for O2=497kJ/mol ; 螖贬鈭�for one C=O in CO2=535kJ/mol]

a.role="math" localid="1648191068323" CH4+2O2鈫�CO2+2H2O

b.2CH4+7O2鈫�4CO2+6H2O

For a reaction with Keq=0.8and Ea=80kJ/mol, decide which of the following statements is (are) true. Correct any false statement to make it true. Ignore entropy considerations. (a) The reaction is faster than a reaction with Keq=8and Ea=80kJ/mol. (b) The reaction is faster than a reaction with Keq=0.8and Ea=40kJ/mol. (c) 鈭�G掳 for the reaction is a positive value. (d) The starting materials are lower in energy than the products of the reaction. (e) The reaction is exothermic.

Consider the following energy diagram for the conversion of A鈫�G.

a. Which points on the graph correspond to transition states?

b. Which points on the graph correspond to reactive intermediates?

c. How many steps are present in the reaction mechanism?

d. Label each step of the mechanism as endothermic or exothermic.

e. Label the overall reaction as endothermic or exothermic.

Question: Draw an energy diagram for a reaction in which the products are higher in energy than the starting materials and Eais large. Clearly label all of the following on the diagram: the axes, the starting materials, the products, the transition state, 鈭�H掳,and Ea.
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