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Chemistry
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OpenStudy (anonymous):
Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the following endothermic reaction. NH4NO3(s) + H2O(l) NH4NO3(aq) ΔH = +25.7 kJ
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OpenStudy (joannablackwelder):
Interesting. ;-)
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