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

Question 81

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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 Δ\Delta G and Δ\Delta H.

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Instant cold packs become cold upon mixi...

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