Calculate the change in Gibbs free energy for each of the following sets of ?Hrxn, ?Srxn, and T. 1. ?Harxn=81 kj, ?Srxn= 144 J/K, T= 302 K Express your answer using two significant figures. 2. ?Harxn= 81 kJ, ?Srxn=144 J/K, T= 755 K Express your answer using two significant figures. 3. ?HOrxn= 81 kj, ?Srxn=-144 J/K, T= 302 K Express your answer using two significant figures.