A quantity of 4.00 x 10^2 mL of 0.600 M HNO3 is mixed with 4.00 x 10^2mL of 0.300 M Ba(OH)2 in a constant-pressure calorimeter of negligible heat capacity.The initial temperature of both solutions is the same at 18.468 C. The heat of the neutralization reaction is -56.2 kJ/mol. What is the final temperature of the solution?