Domanda del libro di testo
The Kb for methylamine (CH3NH2) at 25 °C is given in Appendix D. (d) What is the value of ΔG when [H+] = 6.7 × 10-9 M, [CH3NH3+] = 2.4 × 10-3 M, and [CH3NH2] = 0.098 M?
Ch.19 - Chemical Thermodynamics
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Capitolo 19, Problema 85a
(a) Which of the thermodynamic quantities T, E, q, w, and S are state functions? (b) Which depend on the path taken from one state to another?
Guida verificata passo dopo passo1
Identify the definition of a state function: A state function is a property whose value does not depend on the path taken to reach that specific value. It depends only on the current state of the system.
List the given thermodynamic quantities: T (temperature), E (internal energy), q (heat), w (work), and S (entropy).
Determine which of these quantities are state functions: Temperature (T), internal energy (E), and entropy (S) are state functions because they depend only on the state of the system, not on how the system got to that state.
Identify which quantities depend on the path taken: Heat (q) and work (w) are not state functions because they depend on the specific path taken during a process.
Summarize: State functions (T, E, S) are independent of the path, while path functions (q, w) depend on the path taken between two states.
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State Functions
State functions are properties of a system that depend only on its current state, not on the path taken to reach that state. Examples include temperature (T), internal energy (E), enthalpy, and entropy (S). These quantities are useful in thermodynamics because they allow for the determination of system properties without needing to know the specific process involved.
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03:37
Logarithmic Functions
Path Functions
Path functions are properties that depend on the specific path taken during a process. Unlike state functions, their values change based on the route taken from one state to another. Heat (q) and work (w) are classic examples of path functions, as their values can vary significantly depending on the process used to transfer energy.
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03:37Logarithmic Functions
Thermodynamic Processes
Thermodynamic processes describe the changes in a system's state due to energy transfer, which can occur as heat or work. Understanding these processes is crucial for distinguishing between state and path functions. For instance, in an isothermal process, temperature remains constant, while in an adiabatic process, no heat is exchanged, illustrating how different paths can affect energy transfer.
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01:18First Law of Thermodynamics
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Domanda del libro di testo
The crystalline hydrate Cd(NO3)2⋅4 H2O(s) loses water when placed in a large, closed, dry vessel at room temperature: Cd(NO3)2⋅4 H2O(s) → Cd(NO3)2(s) + 4 H2O(g) This process is spontaneous and ΔH° is positive at room temperature.
(b) If the hydrated compound is placed in a large, closed vessel that already contains a large amount of water vapor, does ΔS° change for this reaction at room temperature?
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Domanda del libro di testo
The Kb for methylamine (CH3NH2) at 25 °C is given in Appendix D. (a) Write the chemical equation for the equilibrium that corresponds to Kb.
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Domanda del libro di testo
(d) For a reversible isothermal process, write an expression for ΔE in terms of q and w and an expression for ΔS in terms of q and T.
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Domanda del libro di testo
The value of Ka for nitrous acid (HNO2) at 25 °C is given in Appendix D. (d) What is the value of ΔG when [H+] = 5.0⨉10-2 M, [NO2-] = 6.0⨉10-4 M, and [HNO2] = 0.20 M?
351
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Domanda del libro di testo
The crystalline hydrate Cd(NO3)2⋅4 H2O(s) loses water when placed in a large, closed, dry vessel at room temperature: Cd(NO3)2⋅4 H2O(s) → Cd(NO3)2(s) + 4 H2O(g) This process is spontaneous and ΔH° is positive at room temperature.
(a) What is the sign of ΔS° at room temperature?