Ethyl chloride (C2H5Cl) boils at 12 °C. When liquid C2H5Clunder pressure is sprayed on a room-temperature (25 °C)surface in air, the surface is cooled considerably. (a) Whatdoes this observation tell us about the specific heat ofC2H5Cl(g) as compared with that of C2H5Cl(l)? (b) Assumethat the heat lost by the surface is gained by ethyl chloride.What enthalpies must you consider if you were to calculatethe final temperature of the surface?
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.
Ethyl chloride (C2H5Cl) boils at 12 °C. When liquid C2H5Cl
under pressure is sprayed on a room-temperature (25 °C)
surface in air, the surface is cooled considerably. (a) What
does this observation tell us about the specific heat of
C2H5Cl(g) as compared with that of C2H5Cl(l)? (b) Assume
that the heat lost by the surface is gained by ethyl chloride.
What enthalpies must you consider if you were to calculate
the final temperature of the surface?
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