Consider the dissolution of CaCl₂: CaCl₂(s) → Ca²⁺(aq) + 2Cl⁻(aq) ∆H = -81.5 kJ/mol
A 15.0-g sample of CaCl₂ is dissolved in 255.0 g water with both substances at 25.0°C. Calculate the final temperature (in °C) of the solution assuming no heat loss to the surroundings and assuming the solution has a specific heat capacity of 4.184 J/°C･g.