The standard enthalpy change for the dissolution of ammonium nitrate is shown below. If 8.2 grams of solid ammonium nitrated is dissolved in 115.0 grams of water at a temperature of 21.0 degrees C, what will be the final temperature of the solution? You may assume that the specific heat of the solution is the same as the specific heat of pure water (4.184 J/g degrees C) and the calorimeter itself absorbes no heat.
NH4 NO3 -> NH4 +NO3