Short Answer
Sports trainers use cold packs containing ammonium nitrate for injured athletes. Calculate the change in temperature when 47 g of ammonium nitrate (NH4NO3, 80.1 g/mol) dissolves in 100 g water. Assume the specific heat of the solution is 4.5 J/(g C).
NH4NO3(s) 
NH4(aq) 
NO3(aq) H 21.1 kJ/mol
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