   # List three different ways to calculate the standard free energy change, ∆ G °, for a reaction at 25°C. How is ∆ G ° estimated at temperatures other than 25°C? What assumptions are made? ### 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 21Q
Textbook Problem
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## List three different ways to calculate the standard free energy change, ∆G°, for a reaction at 25°C. How is ∆G° estimated at temperatures other than 25°C? What assumptions are made?

Interpretation Introduction

Interpretation: The three different ways to calculate the standard free energy change for a reaction at 25°C and the procedure to calculate the standard free energy change at temperatures above it is to be stated. The assumptions made are to be listed.

Concept introduction: The change in free energy observed during the formation of 1mol of a given substance from its constituent elements, at standard states is known as the standard free energy of formation of that particular compound.

### Explanation of Solution

The three different ways to calculate the standard free energy change for a reaction at 25°C are stated as follows.

1. 1.  The value of ΔS° and that of ΔH° are determined and on basis of this the value of standard free energy change (ΔG°) is calculated. This is done using the formula, ΔG°=ΔH°TΔS°
2. 2. The standard free energy change (ΔG°) for a reaction can be calculated by the formula, ΔG°=npΔGf(products)°nrΔGf(reactants)°

Where,

• np is the number of moles of products.
• nr is the number of moles of reactants

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