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At 25 oC, the equilibrium partial pressures for the reaction 3 A(g) + 4 B(g) ⇌ 2 C(g) + 2 D(g) were found to be PA = 5.09 atm, PB = 5.89 atm, PC = 5.56 atm, and PD = 4.51 atm. What is the change in Gibbs free energy of this reaction at 25 oC?