After mixing the two, the temperature rises to 21.21 degrees Celsius. Calculate the heat generated by the reaction, and then calculate how many kJ were released per mole of reactant. Find the kJ and the kJ/mol. A 50.0 ml sample of 0.250 M HCl is added to a 50.0 ml sample of 0.250 M NaOH in a Styrofoam coffee cup calorimeter. Both solutions are at initial temperatures of 19.50 degrees Celsius.