Considering the equilibrium
A ( g ) -<-> 2 B ( g ) + 3 C ( g )
at the temperature of 25 degree celsius. Determine ?G?r for this reaction When A is full into a cylinder at a pressure of 9.89 atm and the system is permitted to come to equilibrium, the final pressure was 15.94 atm.? Express your answer in units of kJ/mol