When solid ammonium nitrate dissolves in water, the solution becomes cold (this is the basis for an “instant ice pack”). When 2.21 g of solid NH4NO3 dissolves in 50.0 g of water at 24.9 °C in a calorimeter, the temperature decreases to 20.3 °C. Calculate the enthalpy of solution ΔH for the dissolution) per mole of NH4NO3 under these conditions.
