A 50.0 mL sample of 0.150 M aqueous hydrochloric acid is added to 50.0 mL of 0.150 M aqueous ammonia in a coffee cup calorimeter. The following reaction occurs when the two solutions are mixed:

HCl(aq) + NH₃(aq) NH₄Cl(aq)

The temperature of the solution increases by 2.30C. Calculate _rH per mole of HCl and NH₃ reacted.

Assume no heat is lost to the calorimeter, and the density and specific heat capacity of the solution is that of pure water (d=1 g/mL, C_s = 4.18 J/gK).