The acid dissociation constant for a weak acid HX at 25 degrees C is 1.80 x 10-5. Calculate the free energy of formation for X-(aq) at 25 degrees C. The standard free energies of HX(aq) and H+(aq) at 25 degrees C are -211.5 kJ/mol and 0 respectively. a) -12.5 kj/mol b) 223 kj/mol c) -184.4 kj/mol d) 255 kj/mol