Use standard free energies of formation to calculate G at 25 C for each reaction in Problem

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

Problem 62

For each reaction, calculate ΔH°_rxn, ΔS°_rxn, and ΔG°_rxn at 25 °C and state whether or not the reaction is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 °C?

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a. 2 CH₂(g) b. 2 NH3(g) C₂H6(g) + H₂(g) N₂H₂(g) + H₂(g) c. N₂(g) + O₂(g) →→→ 2 NO(g) d. 2 KCIO3(s)→→→→→2 KCl(s) + 3 O₂(g)