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(a) When a 4.75-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter (see figure), the temperature drops from 23.0‹C to 16.6‹C. Calculate ƒ¢H (in kJ/mol NH4NO3) for the solution process

NH4NO3(s) ¨ NH4+(aq) + NO3−(aq).
Assume that the specific heat of the solution is the same as that of pure water.

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