4) The compound C2Cl3F3 has a normal boiling point of 47.6 °C. The specific heat of this compound is 0.91 J/gC for the liquid state and the heat of vaporization is 27.49 kJ/mol. A 20.0 g sample of C2Cl3F3 at 42.3 °C is completely vaporized. A. How much energy is needed to heat this sample to its boiling point? B. During this process how is the average kinetic energy of the molecules changing? C. How much energy is needed to vaporize this sample once it reaches the boiling point?
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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