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 ( AHP) and the standard molar entropy (S) values for diamond and graphite. Part A AGion= What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K? Cdiamond graphite Express your answer to three significant figures and include the appropriate units. ▸ View Available Hint(s) Submit Substance Cgraphite Cdiamond Previous Answers ΔΗ} (kJ/mol) 0 1.897 Templates Symbols undo regio Teset keyboard shortcuts help V Value Units S (J/mol. K) 5.740 2.38

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+ Gibbs Free Energy: Spontaneity
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
AGAH-TAS
where AGin is the standard Gibbs free energy change for a reaction,
AH is the standard enthalpy change for a reaction, I' is the
temperature in kelvins, and ASin is the standard entropy change for a
reaction.
For a reaction at equilibrium, AGxn is equal to zero. For negative
values, the reaction is spontaneous, and for positive values the reaction is
nonspontaneous.
Part A
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 (
AHP) and the standard molar entropy (S°) values for diamond and graphite.
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K?
Cdiamond →Cgraphite
AGin =
Express your answer to three significant figures and include the appropriate units.
▸ View Available Hint(s)
Submit
Substance
Cgraphite
Cdiamond
Value
11
Templates Symbols undo redo reset keyboard shortcuts help
3/
Previous Answers
AHP (kJ/mol)
0
1.897
Units
+
X Incorrect; Try Again; 5 attempts remaining
So (J/mol. K)
5.740
39 of 41
2.38
Review | Constants | Periodic Table
Transcribed Image Text:+ Gibbs Free Energy: Spontaneity 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 AGAH-TAS where AGin is the standard Gibbs free energy change for a reaction, AH is the standard enthalpy change for a reaction, I' is the temperature in kelvins, and ASin is the standard entropy change for a reaction. For a reaction at equilibrium, AGxn is equal to zero. For negative values, the reaction is spontaneous, and for positive values the reaction is nonspontaneous. Part A 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 ( AHP) and the standard molar entropy (S°) values for diamond and graphite. What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K? Cdiamond →Cgraphite AGin = Express your answer to three significant figures and include the appropriate units. ▸ View Available Hint(s) Submit Substance Cgraphite Cdiamond Value 11 Templates Symbols undo redo reset keyboard shortcuts help 3/ Previous Answers AHP (kJ/mol) 0 1.897 Units + X Incorrect; Try Again; 5 attempts remaining So (J/mol. K) 5.740 39 of 41 2.38 Review | Constants | Periodic Table
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