21. What are three different methods to calculate AGⓇ for a reac- tion? Which method would you choose to calculate AGº for a reaction at a temperature other than 25 °C?

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63. Use standard free energies of formation to calculate AGºat 25 °C for each reaction in Problem 61. How do the values of AGⓇ calculated this way compare to those calculated from AHⓇ and AS"? Which of the two methods could be used to determine how AGº changes with temperature?

64. Use standard free energies of formation to calculate AG° at 25°C for each reaction in Problem 62. How well do the values of AGⓇ calculated this way compare to those calculated from AH and AS? Which of the two methods could be used to determine how AGº changes with temperature?

85. Our atmosphere is composed primarily of nitrogen and oxygen, which coexist at 25°C without reacting to any significant extent. However, the two gases can react to form nitrogen monoxide according to the reaction: N2(g) + O2(g) = 2 NO(g) a. Calculate AGⓇ and K, for this reaction at 298 K. Is the reaction spontaneous? b. Estimate AGⓇ at 2000 K. Does the reaction become more spontaneous as temperature increases?