A student was asked to determine the enthalpy of a reaction of NH4NO3 in water using a coffee cup calorimeter. The heat capacity of the calorimeter, Ccal, was determined to be 64.17 JPC. If 1.33x10-3 mol is dissolved in excess water, the temperature drops from 29.0 to 25.0 °C. What is the enthalpy of dissolution of the ammonium salt in J/mol? Assume that all NH4NO3 dissolved in water.
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.
A student was asked to determine the enthalpy of a reaction of NH4NO3 in water using a coffee cup calorimeter. The heat capacity of the calorimeter, Ccal, was determined to be 64.17 JPC. If 1.33x10-3 mol is dissolved in excess water, the temperature drops from 29.0 to 25.0 °C. What is the enthalpy of dissolution of the ammonium salt in J/mol? Assume that all NH4NO3 dissolved in water.
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