Diethyl ether, used as a solvent for extraction of organic compounds from aqueous solutions, has a high vapor pressure which makes it a potential fire hazard in laboratories in which it is used. How much energy is released when 315.0 g is cooled from 153.0°C to 0.0°C? boiling point: 34.5°C Heat of vaporization: 351 J/g Specific heat capacity, (CH3)2O(l): 3.74 J/(g·K) Specific heat capacity, (CH3)2O(g): 2.35 J/(g·K) 145 kJ 158 kJ 116 kJ 63.1 kJ 21.1 kJ
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.
Diethyl ether, used as a solvent for extraction of organic compounds from aqueous solutions, has a high vapor pressure which makes it a potential fire hazard in laboratories in which it is used. How much energy is released when 315.0 g is cooled from 153.0°C to 0.0°C?
boiling point: 34.5°C
Heat of vaporization: 351 J/g
Specific heat capacity, (CH3)2O(l): 3.74 J/(g·K)
Specific heat capacity, (CH3)2O(g): 2.35 J/(g·K)
145 kJ
158 kJ
116 kJ
63.1 kJ
21.1 kJ
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