Consider a one acre field with a 100 ft high layer of air exactly over the field. Water vapor condenses and forms a 0.1 mm layer of dew on the surface of the field. If the air temperature was 60 oF when the dew forms, what is the final temperature of this layer of air (in oF)? Assumptions and Values: • Let the surface of the field be perfectly flat. • Let the air absorb all heat from the formation of the dew. • Let the heat of vaporization of water be ∆Hvap = 44 kJ mol • Let the density of the air be ρair = 1.2 kg m3 • Let the specific heat of the air be Cair = 1.01 J g · oC
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.
Consider a one acre field with a 100 ft high layer of air exactly over the field. Water vapor condenses and forms a 0.1 mm layer of dew on the surface of the field. If the air temperature was 60 oF when the dew forms, what is the final temperature of this layer of air (in oF)? Assumptions and Values: • Let the surface of the field be perfectly flat. • Let the air absorb all heat from the formation of the dew. • Let the heat of vaporization of water be ∆Hvap = 44 kJ mol • Let the density of the air be ρair = 1.2 kg m3 • Let the specific heat of the air be Cair = 1.01 J g · oC
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