At 25 ∘C, the equilibrium partial pressures for the reaction   A(g)+2B(g)↽−−⇀C(g)+D(g) were found to be ?A=5.01 atm, ?B=4.25 atm, ?C=5.14 atm, and ?D=5.75 atm. What is the standard change in Gibbs free energy of this reaction at 25 ∘C?

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