Domanda del libro di testo
b. If energy can flow in and out of the system to maintain a constant temperature during the process, what can you say about the entropy change of the surroundings as a result of this process?
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Ch.19 - Chemical Thermodynamics
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Capitolo 19, Problema 5c
The accompanying diagram shows how entropy varies with temperature for a substance that is a gas at the highest temperature shown. (c) If this substance is a perfect crystal at T = 0 K, what is the value of S at this temperature?
Guida verificata passo dopo passo1
Identify the concept of entropy (S) and its relation to temperature. Entropy is a measure of the disorder or randomness in a system.
Recall the Third Law of Thermodynamics, which states that the entropy of a perfect crystal at absolute zero (0 K) is exactly zero.
Understand that a perfect crystal is a substance with a perfectly ordered structure, meaning there is only one possible microstate.
Apply the Third Law to the given problem: since the substance is a perfect crystal at T = 0 K, the entropy S at this temperature is zero.
Conclude that the value of S at T = 0 K for a perfect crystal is 0 J/K.
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Entropy
Entropy is a measure of the disorder or randomness in a system. In thermodynamics, it quantifies the number of microscopic configurations that correspond to a thermodynamic system's macroscopic state. Higher entropy indicates greater disorder, while lower entropy suggests more order. Understanding entropy is crucial for analyzing the behavior of substances at different temperatures.
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Percorso guidato
02:46
Entropy in Thermodynamics
Third Law of Thermodynamics
The Third Law of Thermodynamics states that as the temperature of a perfect crystal approaches absolute zero (0 K), the entropy of the crystal approaches a constant minimum, which is typically zero. This principle implies that at absolute zero, a perfect crystal has no disorder, and thus its entropy is zero. This law is fundamental in understanding the behavior of materials at low temperatures.
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01:11Third Law of Thermodynamics Example
Temperature and Phase Changes
Temperature is a measure of the average kinetic energy of the particles in a substance. As temperature changes, substances can undergo phase changes, affecting their entropy. For gases, the entropy increases significantly with temperature due to increased molecular motion and disorder. Recognizing how temperature influences entropy is essential for interpreting thermodynamic diagrams and understanding the state of a substance.
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01:46Entropy in Phase Changes
Pratica correlata
Domanda del libro di testo
Predict the signs of ΔH and ΔS for this reaction. Explain your choice.
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Domanda del libro di testo
Isomers are molecules that have the same chemical formula but different arrangements of atoms, as shown here for two isomers of pentane, C5H12.
(a) Do you expect a significant difference in the enthalpy of combustion of the two isomers? Explain.
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Domanda del libro di testo
Isomers are molecules that have the same chemical formula but different arrangements of atoms, as shown here for two isomers of pentane, C5H12.
(b) Which isomer do you expect to have the higher standard molar entropy? Explain.
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