Thermochemistry Help?

When 40.0 mL of 0.200 M HCl at 21.5oC is added to 40.0 mL of 0.200 M NaOH also at 21.5oC in a coffee-cup calorimeter, the temperature of the resulting solution rises to 22.8oC. ume that the volumes are additive, and the specific heat of the solution and density are the same as pure water. Calculate delta H for the reaction, HCl + NaOH => NaCl + H2O