At 25 ∘C, the equilibrium partial pressures for the reaction. A(g)+2B(g)↽−−⇀C(g)+D(g)  were found to be ?A=5.87atm , ?B=4.43atm, ?C=4.92atm, and ?D=5.91atm. What is the standard change in Gibbs free energy of this reaction  ?at 25 ∘C? ΔGrxn∘= kJmol

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