Calculate ΔG∘rxn again at 25∘C, but use the equation ΔG∘rxn=ΔH∘rxn−TΔS∘rxn to determine the value. 2. Use your results to calculate ΔG∘rxn at 500.0 K. Express the free energy to four significant figures and include the appropriate units.

Q: Determine the standard free energy change, ΔG°,

A: Δ G = Δ H − T Δ S  Δ H =  625.5 kJ  ∆S° = 450.0 J/K = 450 x 10-3 KJ/K T = 25.0°C + 273 = 298K

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