Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 KK?
Express your answer to three significant figures and include the appropriate units.
Transcribed Image Text:I Review | Constants | Periodic Table
Gibbs free energy is a measure of the spontaneity of a
chemical reaction. It is the chemical potential for a
reaction, and is minimized at equilibrium. The change in
Gibbs free energy can be calculated by
Elemental carbon usually exists in one of two forms: graphite or diamond. It is generally believed that diamonds last forever. The table
shows the standard enthalpy of formation (AH7) and the standard molar entropy (S°) values for diamond and graphite.
Substance
AH? (kJ/mol)
S° (J/mol - K)
AGan = AHn– TAS
Cgraphite
5.740
where AGixn is the standard Gibbs free energy change
for a reaction, AHan is the standard enthalpy change
for a reaction, T is the temperature in kelvins, and
ASxn is the standard entropy change for a reaction.
Cdiamond
1.897
2.38
For a reaction at equilibrium, AGixn is equal to zero.
For negative values, the reaction is spontaneous, and
for positive values the reaction is nonspontaneous.
Part A
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K?
CdiamondCgraphite
Express your answer to three significant figures and include the appropriate units.
> View Available Hint(s)
HA
AGixn =
Value
Units
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