   # A friend tells you, “Free energy G and pressure P are related by the equation G = G ° + RT ln( P ). Also, G is related to the equilibrium constant K in that when G products = G reactants ，the system is at equilibrium. Therefore, it must be true that a system is at equilibrium when all the pressures are equal.” Do you agree with this friend? Explain. ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 16, Problem 5ALQ
Textbook Problem
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## A friend tells you, “Free energy G and pressure P are related by the equation G = G° + RT ln(P). Also, G is related to the equilibrium constant K in that when Gproducts = Greactants，the system is at equilibrium. Therefore, it must be true that a system is at equilibrium when all the pressures are equal.” Do you agree with this friend? Explain.

Interpretation Introduction

Interpretation: The authenticity of the statement, “a system is at equilibrium when all the pressures are equal”, with respect to the given data is to be determined.

Concept introduction: The relation between free energy and pressure is G=G°+RTlnP

### Explanation of Solution

The relation between free energy and pressure is,

G=G°+RTlnP

Where,

• G is the Gibb’s free energy.
• G° is the free energy at 1atm .
• R is the universal gas constant.
• T is the temperature.
• P is the pressure.

At equilibrium,

ΔG=0GproductsGreactants=0

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