Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam.(d) With 5.0 parts steam to 1.0 part ethylbenzene in the reactant mixture and the total pressure kept constant at 1.3 atm, what is ΔG at 50.% conversion, that is, when 50.% of the ethylbenzene has reacted?