A certain hypothetical substance "AB", in the gaseous state, dissociating to produce species A (in the gaseous state) and species B (also in the gaseous state) according to the following equation...

Extracted text: A certain hypothetical substance "AB", in the gaseous state, dissociating to produce species A (in the gaseous state) and species B (also in the gaseous state) according to the following equation (Consider that the system is in balance). AB(9) 2 A(g) + Bg) At 300 K and a total pressure of 1 atm, the degree of dissociation (alpha=advance/number of moles hypothetical reagent) of AB(g) is 0.2. Calculate the standard free energy variation for this reaction in Joules per mol.