Mayuri was performing thermometric titration and she took 100 ml of 1M sulphuric acid and started adding 1M calcium hydroxide. When she plotted a graph of temperature vs volume of the titrant added, she found that the temperature was initially increasing and then it started decreasing. The maximum of the graph is obtained at 100 ml of calcium hydroxide. What will be the enthalpy change of this reaction?

[Given: ΔH = –13.7 kcal/eq ]