Compounds like CCl2F2 are known as chlorofluorocarbons,or CFCs. These compounds were once widely used as refrigerantsbut are now being replaced by compounds that arebelieved to be less harmful to the environment. The heatof vaporization of CCl2F2 is 289 J/g. What mass of this substancemust evaporate to freeze 200 g of water initially at15 °C? (The heat of fusion of water is 334 J/g; the specificheat of water is 4.18 J/g-K.)
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.
Compounds like CCl2F2 are known as chlorofluorocarbons,
or CFCs. These compounds were once widely used as refrigerants
but are now being replaced by compounds that are
believed to be less harmful to the environment. The heat
of vaporization of CCl2F2 is 289 J/g. What mass of this substance
must evaporate to freeze 200 g of water initially at
15 °C? (The heat of fusion of water is 334 J/g; the specific
heat of water is 4.18 J/g-K.)
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