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Use standard free energies of formation to calculate ΔG∘ at 25∘C for each of the following...

Use standard free energies of formation to calculate ΔG∘ at 25∘C for each of the following reactions.

N2O4(g)→2NO2(g)

ΔG∘rxn =

2.8

   kJ

NH4Cl(s)→HCl(g)+NH3(g)

ΔG∘rxn =

91.2

   kJ

3H2(g)+Fe2O3(s)→2Fe(s)+3H2O(g)

ΔG∘rxn =

56.4

   kJ

N2(g)+3H2(g)→2NH3(g)

ΔG∘rxn = -32.8 kJ

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? Essay answers are limited to about 500 words (3800 characters maximum, including spaces).

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