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Commercial Cold Packs Often Contain Solid NH4NO3 and a Pouch

Question 160

Multiple Choice

Commercial cold packs often contain solid NH4NO3 and a pouch of water.The temperature of the pack drops as the NH4NO3 dissolves in water.Therefore,for the dissolving of NH4NO3 in water,


A) ΔHsoln is negative and ΔSsoln may be negative or positive.
B) ΔHsoln is negative and ΔSsoln is positive.
C) ΔHsoln is positive and ΔSsoln may be negative or positive.
D) ΔHsoln is positive and ΔSsoln is positive.

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