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Answer 1 · 2017-12-31T18:10:32

If you specified the data related to enthalpy and entropy, we could calculate the free energy change via,

#DeltaG = DeltaH^° - TDeltaS#

But you want to make it hard for me! Let's calculate the enthalpy and entropy of the reaction you specified,

#N_2O_4(g) to 2NO_2(g)#, where

#DeltaH° = 58kJ#

#DeltaS = (176J)/K#

assuming that dinitrogen tetroxide is a gas.

Hence,

#DeltaG° = 58*10^3 J - 298K * (176J)/K#
#therefore DeltaG° = 5.6kJ#