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For the dissociation reaction: A2(g) ⇌ A2(g) is the equilibrium constant K=0.347 at the temperature T=300K,...

For the dissociation reaction: A2(g) ⇌ A2(g)  
is the equilibrium constant K=0.347 at the temperature T=300K, when the status of the standard is adopted (in other words partial pressure 1 bar for gases).

A) Calculate the ΔGr for the reaction at T=300K

B) calculate at which total pressure the molar fraction is 0.280 at 300K for the mixture.

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