A quantity of 2.00x10^2 ml of 0.862 M HCl is mixed with 2.00x10^2ml of 0.431 M Ba(OH)2 in a constant-pressure calorimeter of negligible capacity. The initial temperature of the HCl and Ba(OH)2 solutions is the same at 20.48 degreesC. For the process
H+(aq)+OH-(aq)----->H2O(l)
the heat of neutralization is -56.2 kJmol. What is the final temperature of the mixed solution?