Consider a container with a frictionless piston that contains a given amount of an ideal gas. If the external pressure is kept constant, the piston will move up or down in response to a change in the internal pressure. The piston will move up if P> Pext and vice versa. The piston will stop moving when PirPet (the system is equilibrated). The container has 0.8 mol of an ideal gas initially at 24 °C and the system is in equilibrium with an external pressure of 1.2 bar. The gas is slowly heated to a final temperature of 305 °C. During this process, the piston is allowed to move if necessary to keep the system at equilibrium (that is, the internal pressure is allowed to match the external pressure at all times). The molar heat capacity at constant volume Cem of this ideal gas is 2.5 R.
Consider a container with a frictionless piston that contains a given amount of an ideal gas. If the external pressure is kept constant, the piston will move up or down in response to a change in the internal pressure. The piston will move up if P> Pext and vice versa. The piston will stop moving when PirPet (the system is equilibrated). The container has 0.8 mol of an ideal gas initially at 24 °C and the system is in equilibrium with an external pressure of 1.2 bar. The gas is slowly heated to a final temperature of 305 °C. During this process, the piston is allowed to move if necessary to keep the system at equilibrium (that is, the internal pressure is allowed to match the external pressure at all times). The molar heat capacity at constant volume Cem of this ideal gas is 2.5 R.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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Transcribed Image Text:Consider a container with a frictionless piston that contains a given amount of an ideal gas. If the external pressure is kept constant, the piston will move up or down in response to a change in the internal pressure. The piston will move up if Pint > Pext and vice versa. The piston will stop moving when
Pint - Pext (the system is equilibrated).
The container has 0.8 mol of an ideal gas initially at 24 °C and the system is in equilibrium with an external pressure of 1.2 bar. The gas is slowly heated to a final temperature of 305 °C. During this process, the piston is allowed to move if necessary to keep the system at equilibrium (that
is, the internal pressure is allowed to match the external pressure at all times). The molar heat capacity at constant volume Cum of this ideal gas is 2.5 R.
Transcribed Image Text:Part D - Calculate q, the amount of heat exchanged in the process.
Express your answer in kJ with 3 significant figures. Be careful with signs!
The margin of error for this answer is 2%.
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Part E-Calculate the change in internal energy.
AU =
?
Express your answer in kJ with 3 significant figures. Pay attention to the sign!
The margin of error for this answer is 2%.
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KJ
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KJ
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