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 61. How 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 61

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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2 NO₂(g) HCI(g) + NH3(g) a. N₂04(g) b. NH4Cl(s) c. 3 H₂(g) + Fe₂O3(s) d. N₂(g) + 3 H₂(g) →→→ 2 NH3(g) 2 Fe(s) + 3 H₂O(g)