The ionization energy for potassium is 419 kJ /mol: The electron affinity for bromine is -325 kJ /mol_ Use these values and Hess's law to calculate the change in enthalpy for the following reaction per mole of reagent: K(g) + Br(g)-K-(g) + Br- (g) , AH = ? Express your answer with the appropriate units View Available Hint(s) Hint 1. How to approach the problem An ionization energy value or electron affinity value represents the enthalpy change for the corresponding reaction: reaction 1: K(g) reaction 2: Br(g) + e Kt(g) + e Br AH = 419 kJ AH =-325 kJ overall: K(g) Br(g) 7 K' (g) + Br (g) AH =? Since the overall reaction is the sum of two reactions with known enthalpy values_ we can use Hess's law t0 determine the overall enthalpy: Hess's law states that if a reaction is carried out in a series of steps, 4 H for the overall reaction will equal the sum of the enthalpy changes for the individual steps_ AH per mole Value Units