Instant Cold Packs Get Cold When the Contents, Usually Solid $\Delta$

question 53

Short Answer

Instant cold packs get cold when the contents, usually solid urea and liquid water, are mixed, producing an aqueous solution of urea. Although this process is clearly spontaneous, the products are colder than the reactants. Explain how this is possible in terms of the difference between $\Delta$ G and $\Delta$ H.

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