(a) When a 4.25-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter (Figure), the temperature drops from 22.0 to 16.9 °C. Calculate ΔH (in kJ/mol NH4NO3) for the solution process:
Figure Coffee-cup calorimeter. This simple apparatus is used to measure temperature changes of reactions at constant pressure
NH4NO3(s)→ NH4 +(aq) + NO3–(aq)
Assume that the specific heat of the solution is the same as that of pure water
(b) Is this process endothermic or exothermic?
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