8. Instant cold packs can be made from ammonium nitrate by mixing/reacting it with water (reaction shown below). When 1.25 g of NH4NO3 is dissolved in 25.0 g of water at 25.8 °C, the temperature of the water after the reaction is 21.9 °C. What is the enthalpy change (AH) for this reaction in units of kJ/mol of NH&NO3? The heat capacity of water is 4.18 g°C' NHNO3(s) → NH(aq) + NO5 (aq) (bp)- 9. How many grams of ammonium nitrate would be necessary to cause the water in the cold pack described in Question 8 to reach 3.0 °C from the original temperature of 25.8 °C?
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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8. Instant cold packs can be made from ammonium nitrate by mixing/reacting it with water
(reaction shown below). When 1.25 g of NH4NO3 is dissolved in 25.0 g of water at 25.8 °C, the
temperature of the water after the reaction is 21.9 °C. What is the enthalpy change (AH) for this
reaction in units of kJ/mol of NH¼NO3? The heat capacity of water is 4.18
g°C
NH,NO35) → NH (aq) + NO3 (aq)
9. How many grams of ammonium nitrate would be necessary to cause the water in the cold pack
described in Question 8 to reach 3.0 °C from the original temperature of 25.8 °C?
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