When some pellets of KOH react with 100 mL of 1.0 M HCl in a beaker, the temperature of the solution rises by 4.5C. If the molar enthalpy of solution of KOH is -57.61 kJ and the molar enthalpy of reaction of KOH and HCl is -57.2 kJ, what mass of KOH was used in the experiment? (Atomic masses of K, O, and H are 39.10, 16.00, and 1.01 u) (heat capacity of the solution is water, so 4.184 J g-1 C-1.)