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 23.56 ∘C
to 27.92 ∘C.
If the solution has the same density and specific heat as water ( 1.00 g/mL
and 4.184J/g⋅°C,)
respectively), what is Δ
for this reaction (per mole H2O
produced)? Assume that the total volume is the sum of the individual volumes.