Review | Constants I Periodie Table Entropy, denoted by the symbol S. is the thermodynamic property describing the amount of molecular randomness or disorder in a system. It is a state thermodynamic function, meaning that its value does not depend on the path used to arive at a specific set of conditions. Each system with a specified temperature, pressure, and composition has a unique entropy value. the temperature of a perfect crystal increases, the random vibrations of the molecules decrease. O At the melting point, the entropy of a system increases abruptly as the compound transforms into a liquid. The entropy change. A:S. is the difference in entropy between two states of a system, such as between the reactants and products of a reaction or between a flask before and after adding a mixture of gas Previous Answere v Correct The third law of thermodynamics deals with the entropy of a system and the chemical bonding in the molecules. Whenever there is a change in phase from a solid to a liquid or from a liquid to a gas, the vibrational and rotational motions of molecules increase; therefore, the entropy of the system increases as the phase changes. At absolute zero, the entropy of any perfect system becomes zero. • Part B Calculate the standard-state entropy for the follovwing reaction: 2NIS(s) + 30,(9)-→250;(9) + 2NIO(s) The standard entropy values are given in the table. s° Formula 1K-mol SO:(9) 248 NiO(a) 38.0 Nis(s) 53.0 O:(9) 205 Express your answer with the appropriate units > View Available Hint/s) empigtes Symbola undo regdo fesér keyboard shortcuts Help J A,S° = - 1479 mol •k
Review | Constants I Periodie Table Entropy, denoted by the symbol S. is the thermodynamic property describing the amount of molecular randomness or disorder in a system. It is a state thermodynamic function, meaning that its value does not depend on the path used to arive at a specific set of conditions. Each system with a specified temperature, pressure, and composition has a unique entropy value. the temperature of a perfect crystal increases, the random vibrations of the molecules decrease. O At the melting point, the entropy of a system increases abruptly as the compound transforms into a liquid. The entropy change. A:S. is the difference in entropy between two states of a system, such as between the reactants and products of a reaction or between a flask before and after adding a mixture of gas Previous Answere v Correct The third law of thermodynamics deals with the entropy of a system and the chemical bonding in the molecules. Whenever there is a change in phase from a solid to a liquid or from a liquid to a gas, the vibrational and rotational motions of molecules increase; therefore, the entropy of the system increases as the phase changes. At absolute zero, the entropy of any perfect system becomes zero. • Part B Calculate the standard-state entropy for the follovwing reaction: 2NIS(s) + 30,(9)-→250;(9) + 2NIO(s) The standard entropy values are given in the table. s° Formula 1K-mol SO:(9) 248 NiO(a) 38.0 Nis(s) 53.0 O:(9) 205 Express your answer with the appropriate units > View Available Hint/s) empigtes Symbola undo regdo fesér keyboard shortcuts Help J A,S° = - 1479 mol •k
Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter10: Entropy And The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 10.29PAE
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Transcribed Image Text:I Review Constants | Periodic Table
O As the temperature of a perfect crystal increases, the random vibrations of the molecules decrease.
Entropy, denoted by the symbol S, is the thermodynamic property describing the amount of
molecular randomness or disorder in a system. It is a state thermodynamic function, meaning that
its value does not depend on the path used to arrive at a specific set of conditions. Each system
with a specified temperature, pressure, and composition has a unique entropy value.
O At the melting point, the entropy of a system increases abruptly as the compound transforms into a liquid.
The entropy change, A:S, is the difference in entropy between two states of a system, such as
between the reactants and products of a reaction or between a flask before and after adding a
mixture of gas.
Prevlous Answera
v Correct
The third law of thermodynamics deals with the entropy of a system and the chemical bonding in the molecules. Whenever there is a change in phase from a solid to a liquid or from a liquid to a gas, the vibrational and
rotational motions of molecules increase; therefore, the entropy of the system increases as the phase changes. At absolute zero, the entropy of any perfect system becomes zero.
• Part B
Calculate the standard-state entropy for the following reaction:
2NIS(s) + 302(9)250(9) + 2NIO(s)
The standard entropy values are given in the table.
Formula
JK-' mol-
sO2(9)
248
NiO(s)
38.0
NIS(s)
53.0
Oz(9)
205
Express your answer with the appropriate units.
• View Available Hint(s)
Tempjates Symbols undo redo reser keyboard shortcuts Help
J
A,S° =
1479
mol •k
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