A system has 1.00-mol Ar gas confined in a container (with a fixed volume of 20.0 L) initially at 310 K. If 265 J of heat is removedfrom the Ar gas and the volume of container remains as 20.0 L during the process, the internal energy change of the system ∆U should be ______. ∆U = 265 J ∆U > 265 J -265 J < ∆U < 265 J ∆U = - 265 J ∆U < - 265 J
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.
A system has 1.00-mol Ar gas confined in a container (with a fixed volume of 20.0 L) initially at 310 K. If 265 J of heat is removedfrom the Ar gas and the volume of container remains as 20.0 L during the process, the internal energy change of the system ∆U should be ______.
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∆U = 265 J
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∆U > 265 J
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-265 J < ∆U < 265 J
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∆U = - 265 J
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∆U < - 265 J |
Given, amount of heat removed from the Ar gas container ( System) = - 265 J
initial volume V1 = 20.0 L
final volume V2 = 20.0 L so, change in volume ∆V = 0
we are asked to calculate the change in the internal energy of the system ∆U.
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