Chapter 5, Problem 50E

How much heat is produced when loo mL of 0.250 M HCl (density, 1.00 g/mL) and 200 mL of 0.150 M NaOH (density, 1.00 g/mL) are mixed?

$\text{HCl}\left(aq\right)+\text{NaO}\left(aq\right)\to \text{NaCl}\left(aq\right)+{\text{H}}_2\text{O}\left(l\right)\Delta H_{298}^{°}=-58\text{kJ}$

If both solutions are at the same temperature and the heat capacity of the products is 4.19 J/g °C, how much will the temperature increase? What assumption did you make in your calculation?