Chemical cold packs are carried by athletic trainers when transporting ice is no

Question

Chemical cold packs are carried by athletic trainers when transporting ice is not possible. The temperature of a cold pack is lowered when an internal seal is broken and solid ammonium nitrate dissolves in water that had been in a separate part of the package. How can the enthalpy change for this reaction be predicted? AH will be positive because the reaction absorbs heat from the surroundings. All will be positive because the reaction releases heat to the surroundings. All will be negative because the reaction absorbs heat from the surroundings. AH will be negative because the reaction releases heat to the surroundings.

Explanation / Answer

dH must be postive, since it absorbs heat form the surroundings, that is, will cool the outside; which is what the physician will want to do to the trainer

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