(a)
Interpretation:
The standard free energy change
Concept introduction:
Free energy(Gibbs free energy) is the term that is used to explain the total energy content in a
Where
(b)
Interpretation:
The standard free energy change
Concept introduction:
Free energy(Gibbs free energy) is the term that is used to explain the total energy content in a thermodynamic system that can be converted into work. The free energy is represented by the letter
Where
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Chemistry: Atoms First
- What information can be determined from G for a reaction? Does one get the same information from G, the standard free energy change? G allows determination of the equilibrium constant K for a reaction. How? How can one estimate the value of K at temperatures other than 25C for a reaction? How can one estimate the temperature where K = 1 for a reaction? Do all reactions have a specific temperature where K = 1?arrow_forwardGiven: P4(s)+5O2(g)P4O10(s)G298=2697.0kJ/mol 2H2(g)+O2(g)2H2O(g)G298=457.18kJ/mol 6H2O(g)+P4O10(s)4H3PO4(l)G298=428.66kJ/mol (a) Determine the standard free energy of formation, Gf, for phosphoric acid. (b) How does your calculated result compare to the value in Appendix G? Explain.arrow_forwardGiven the following standard free energies at 25°C for the following reactions: N2O5(g)2NO(g)+32O2(g)G=59.2kJNO(g)+12O2(g)NO2(g)G=35.6kJ Calculate G° at 25°C for the following reaction: 2NO2(g)+12O2(g)N2O5(g)arrow_forward
- Using values of fH and S, calculate rG for each of the following reactions at 25 C. (a) 2 Na(s) + 2 H2O() 2 NaOH(aq) + H2(g) (b) 6 C(graphite) + 3 H2(g) C6H6() Which of these reactions is (are) predicted to be product-favored at equilibrium? Are the reactions enthalpy- or entropy-driven?arrow_forwarda Calculate K1, at 25C for sulfurous acid: H2SO3(aq)H+(aq)+HSO3(aq) b Which thermodynamic factor is the most significant in accounting for the fact that sulfurous acid is a weak acid? Why?arrow_forwardCalculate G at 415 K for each of the reactions in Question 18. State whether the reactions are spontaneous.arrow_forward
- a Calculate K1, at 25C for phosphoric acid: H3PO4(aq)H+(aq)+H2PO4(aq) b Which thermodynamic factor is the most significant in accounting for the fact that phosphoric acid is a weak acid? Why ?arrow_forwardThe standard potential, E, for the reaction of Zn(s) and Cl2(g) is +2.12 V. What is the standard free energy change, rG, for the reaction?arrow_forwardWhat is meant by the standard free-energy change G for a reaction? What is meant by the standard free energy of formation Gf of a substance?arrow_forward
- What is the sign of the standard Gibbs free-energy change at low temperatures and at high temperatures for the explosive decomposition of TNT? Use your knowledge of TNT and the chemical equation, particularly the phases, to answer this question. (Thermodynamic data for TNT are not in Appendix G.) 2C7H5N3O6(s) 3N2(g) + 5H2O() + 7C(s) + 7CO(g)arrow_forwardFrom the values for G f given in Appendix 1, calculate G at 25C for each of the reactions in Question 19.arrow_forwardConsider the reaction: H2S(g)+SO2(g)3S(g)+2H2O(l) for which H is 233 kJ and S is 424 J/K. a. Calculate the free energy change for the reaction (G) at 393 K. b. Assuming H and S do not depend on temperature, at what temperatures is this reaction spontaneous?arrow_forward
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