Exactly 1.5 g of a fuel burns under conditions of constantpressure and then again under conditions of constant volume.In measurement A the reaction produces 25.9 kJ of heat, and inmeasurement B the reaction produces 23.3 kJ of heat. Whichmeasurement (A or B) corresponds to conditions of constantpressure? Which one corresponds to conditions of constantvolume? Explain.
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.
Exactly 1.5 g of a fuel burns under conditions of constant
pressure and then again under conditions of constant volume.
In measurement A the reaction produces 25.9 kJ of heat, and in
measurement B the reaction produces 23.3 kJ of heat. Which
measurement (A or B) corresponds to conditions of constant
pressure? Which one corresponds to conditions of constant
volume? Explain.
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