How to do you find delta H?

In a constant-pressure calorimeter, 70.0 mL of 0.320 M Ba(OH)2 was added to 70.0 mL of 0.640 M HCl. The reaction caused the temperature of the solution to rise from 22.94 °C to 27.30 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g·°C, respectively), what is ΔH for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes.