Ammonium nitrate sometimes is used in cold packs because its enthalpy of solvation in water is 21 kJ/mol. What is the minimum amount of ammonium nitrate (80.05 g/mol) that is needed to cool a 1.0 L soft drink (d 1.0 g/mL, specific heat 4.5 J g1 
) and its plastic bottle (heat capacity 50 J/K) from 30 
to 5 
.
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