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Chapter 6: Problem 6.10 (page 226)

Given each of the following values, is the starting material or product favored at equilibrium?

a.Keq=5.5

b.ΔG°=40kJ/mol


Short Answer

Expert verified

Answer

a. The products are favored at equilibrium.

b. The starting materials are favored at equilibrium.

Step by step solution

01

Step-by-Step SolutionStep 1: Equilibrium Constant

The equilibrium constant is defined as the ratio of the reactant concentrations to the concentration of products.

Keq=productsreactants

The value of Keq>1 indicates that the product is favored, and Keq<1 indicates that reactants are favored.
02

Free energy and Chemical reactions

A chemical reaction proceeds i.e., the reactants convert into products (or the product is favored) only if the free energy change of the reaction is negative.

03

Direction of a chemical reaction

  1. In this case, the equilibrium constant value is 5.5 i.e., Keq>1 and hence the product is favored.
  2. The free energy ΔG° has a positive value which indicates the reaction does not proceed forward and hence it favors the starting material.

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Most popular questions from this chapter

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) ∆G° 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.

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, ∆H°,and Ea.

As we learned in Chapter 4, monosubstituted cyclohexanes exist as an equilibrium mixture of two conformations having either an axial or equatorial substituent. When R=CH2CH3, Keqfor this process is 23. When R=C(CH3)3,Keqfor this process is 4000.

a. When , which conformation is present in higher concentration?

b. Which R shows the higher percentage of equatorial conformation at equilibrium?

c. Which R shows the higher percentage of axial conformation at equilibrium?

d. For which R is more negative?

e. How is the size of R related to the amount of axial and equatorial conformations at equilibrium?

Question: Classify the conversion of A to B as a substitution, elimination, or addition. B can be converted to the female sex hormone estrone in two steps.

Classify each transformation as substitution, elimination, or addition.

a.

b.
See all solutions

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