Question

A coffee-cup calorimeter can be used to study the "cold pack reaction," the process that occurs...

A coffee-cup calorimeter can be used to study the "cold pack reaction," the process that occurs when solid ammonium nitrate dissolves in water.

(dC= degrees celcius)

NH4NO3(s) -----> NH4+(aq) + NO3-(aq)

suppose 25.0 grams of solid ammonium nitrate at 23.0 dC is added to 250. mL of water at the same temperature. After all the solid is dissolved, the temperature is measured to be 15.6dC. Calculate the energy change, in kJ/mole, for this reaction, and state whether the reaction is endothermic or exothermic.

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