Problem

A coffee cup calorimeter can be used to investigate the “cold pack reaction,” the process...

A coffee cup calorimeter can be used to investigate the “cold pack reaction,” the process that occurs when solid ammonium nitrate dissolves in water:

Suppose 25.0 g solid NH4NO3 at 23.0 °C is added to 250. mL H2O at the same temperature. After the solid is all dissolved, the temperature is measured to be 15.6 °C. Calculate the enthalpy change for the cold pack reaction. (Hint: Calculate the energy transferred per mole of NH4NO3.) Is the reaction endothermic or exothermic?

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Solutions For Problems in Chapter 6

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