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At 25 °C, the equilibrium partial pressures for the reaction 2 A(g) + 4 B(g) = 2 C(g)+D(g) were found to be Pa = 4.81 bar, PB = 4.51 bar, Pc = 4.05 bar, and PD = 4.63 bar. What is the standard change in Gibbs free energy of this reaction at 25 °C? AGixn = kJ/mol