Adding 4.50 g of to 140 g of water in a coffee-cup calorimeter (with stirring to dissolve the salt) resulted in a decrease in temperature from 19.9 °C to 17.8 °C. Calculate the enthalpy change for dissolving in water in kJ/mol. Assume the solution (whose mass is 144.5 g) has a specific heat capacity of 4.2 J/g · K. (Cold packs take advantage of the fact that dissolving ammonium nitrate in water is an endothermic process.) A cold pack uses the endothermic enthalpy of a solution of ammonium nitrate. Enthalpy change = kJ/mol
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Adding 4.50 g of to 140 g of water in a coffee-cup calorimeter (with stirring to...