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The standard free energy of formation, AG; , of a substance is the free energy change for the formation of one mole of the substance from the component elements in their standard states. These values are applicable at 25 °C and are found in thermodynamic tables. Consider the reaction KCIO4(s)→KC1(s) +202(g) The value of AG: for a substance gives a measure of the and the following table of values: thermodynamic stability with respect to the component elements. Negative values for a formation reaction indicate thermodynamic stability of the product. In other words, the compound formed does not spontaneously decompose back into the component elements. Positive values for a formation reaction indicate thermodynamic instability of the product. Thus, the compound will spontaneously decompose, though the rate may be slow. AG (kJ/mol) Substance KC1O4(s) -304.4 KCI(s) -408.2 O2(g) The sign of AG? can be used to predict the feasibility of synthesizing a substance from its component elements. The standard free energy change for a reaction, AG° , is a state function and can be calculated from the standard free energies State whether it would be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions and explain why. of formation as follows: Yes, because AG° is negative. Δ G Σn, ΔG; (products) -Σn, ΔG; (reactants) O No, because AG° is negative. where np and ny represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively. O Yes, because AG° is positive. O No, because AG° is positive.

The standard free energy of formation, AG; , of a substance is the free energy change for the formation of one mole of the substance from the component elements in their standard states. These values are applicable at 25 °C and are found in thermodynamic tables. Consider the reaction KCIO4(s)→KC1(s) +202(g) The value of AG: for a substance gives a measure of the and the following table of values: thermodynamic stability with respect to the component elements. Negative values for a formation reaction indicate thermodynamic stability of the product. In other words, the compound formed does not spontaneously decompose back into the component elements. Positive values for a formation reaction indicate thermodynamic instability of the product. Thus, the compound will spontaneously decompose, though the rate may be slow. AG (kJ/mol) Substance KC1O4(s) -304.4 KCI(s) -408.2 O2(g) The sign of AG? can be used to predict the feasibility of synthesizing a substance from its component elements. The standard free energy change for a reaction, AG° , is a state function and can be calculated from the standard free energies State whether it would be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions and explain why. of formation as follows: Yes, because AG° is negative. Δ G Σn, ΔG; (products) -Σn, ΔG; (reactants) O No, because AG° is negative. where np and ny represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively. O Yes, because AG° is positive. O No, because AG° is positive.

Chemistry
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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The standard free energy of formation, AG?, of a substance is the free energy change for the formation of one mole of the substance from the component elements in their standard states. These values are applicable at 25 °C and are found in thermodynamic tables. Consider the reaction KC104 (s)→KC1(s) +202(g) The value of AG; for a substance gives a measure of the thermodynamic stability with respect to the component elements. Negative values for a formation reaction indicate thermodynamic stability of the product. In other words, the compound formed does not spontaneously decompose back into the component elements. Positive values for a formation reaction indicate thermodynamic instability of the product. Thus, the compound will spontaneously decompose, though the rate may be slow. and the following table of values: AG (kJ/mol) Substance KC104 (s) -304.4 KC1(s) -408.2 O2 (g) The sign of AG; can be used to predict the feasibility of State whether it would be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions and explain why. synthesizing a substance from its component elements. The standard free energy change for a reaction, AG°, is a state function and can be calculated from the standard free energies of formation as follows: Yes, because AG° is negative. ΔC Σn, ΔG; (products) -Ση,Δ G; (reactants) No, because AG° is negative. where np and nr represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively. Yes, because AG° is positive. No, because AG° is positive.
Transcribed Image Text:The standard free energy of formation, AG?, of a substance is the free energy change for the formation of one mole of the substance from the component elements in their standard states. These values are applicable at 25 °C and are found in thermodynamic tables. Consider the reaction KC104 (s)→KC1(s) +202(g) The value of AG; for a substance gives a measure of the thermodynamic stability with respect to the component elements. Negative values for a formation reaction indicate thermodynamic stability of the product. In other words, the compound formed does not spontaneously decompose back into the component elements. Positive values for a formation reaction indicate thermodynamic instability of the product. Thus, the compound will spontaneously decompose, though the rate may be slow. and the following table of values: AG (kJ/mol) Substance KC104 (s) -304.4 KC1(s) -408.2 O2 (g) The sign of AG; can be used to predict the feasibility of State whether it would be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions and explain why. synthesizing a substance from its component elements. The standard free energy change for a reaction, AG°, is a state function and can be calculated from the standard free energies of formation as follows: Yes, because AG° is negative. ΔC Σn, ΔG; (products) -Ση,Δ G; (reactants) No, because AG° is negative. where np and nr represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively. Yes, because AG° is positive. No, because AG° is positive.
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