Instant heat packs and cold packs use compounds that have a negative or positive

Question

Instant heat packs and cold packs use compounds that have a negative or positive enthalpy of solution, AHsol, to produce a temperature change. The packs consist of a pouch of water and a dry chemical, CaCl2 for heat packs, or NH4NO3 for cold packs. The pack is activated by breaking the seal of the water pouch, which dissolves the dry chemical and forms a solution that either increases or decreases in temperature Predict the signs of AHsol and ASsol for the following solutions NH,NO3(s) H2O(1) NH,NO,(aq) ASsol > 0 AHsol 0

Explanation / Answer

Instant heat packs and cold packs use compounds that have a negative or positive

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