50.0 ml of 0.500 M NaOH is placed in a coffee-cup calorimeter at 25.00°C. To this solution was added 25.0 ml of 0.500 M HCl (also at 25.00°C). After stirring, the final temperature was 27.21°C. Calculate the heat of the reaction, qrxn, and the ΔHrxn (in kJ/mol).
