Domanda del libro di testo
Without doing any calculations, determine the sign of ΔSsys for each chemical reaction. a. 2 KClO3(s) → 2 KCl(s) + 3 O2(g) c. Na(s) + 2 Cl2(g) → NaCl(s) d. N2(g) + 3 H2(g) → 2 NH3(g)
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Ch.19 - Free Energy & Thermodynamics
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving118
- Ch.2 - Atoms & Elements106
- Ch.3 - Molecules and Compounds131
- Ch.4 - Chemical Reactions and Chemical Quantities56
- Ch.5 - Introduction to Solutions and Aqueous Solutions82
- Ch.6 - Gases114
- Ch.7 - Thermochemistry96
- Ch.8 - The Quantum-Mechanical Model of the Atom60
- Ch.9 - Periodic Properties of the Elements90
- Ch.10 - Chemical Bonding I: The Lewis Model89
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory85
- Ch.12 - Liquids, Solids & Intermolecular Forces51
- Ch.13 - Solids & Modern Materials47
- Ch.14 - Solutions90
- Ch.15 - Chemical Kinetics115
- Ch.16 - Chemical Equilibrium68
- Ch.17 - Acids and Bases136
- Ch.18 - Aqueous Ionic Equilibrium153
- Ch.19 - Free Energy & Thermodynamics93
- Ch.20 - Electrochemistry106
- Ch.21 - Radioactivity & Nuclear Chemistry74
- Ch.22 - Organic Chemistry140
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo
Capitolo 19, Problema 32
Calculate the change in entropy that occurs in the system when 1.50 mol of diethyl ether (C4H10O) condenses from a gas to a liquid at its normal boiling point (34.6 °C). See Table 12.7 for heats of vaporization.
Guida verificata passo dopo passo1
Identify the process: The condensation of diethyl ether from gas to liquid at its boiling point is an isothermal process.
Use the formula for entropy change in an isothermal process: \( \Delta S = \frac{\Delta H_{\text{vap}}}{T} \), where \( \Delta H_{\text{vap}} \) is the heat of vaporization and \( T \) is the temperature in Kelvin.
Convert the temperature from Celsius to Kelvin: \( T = 34.6 + 273.15 \).
Look up the heat of vaporization for diethyl ether from Table 12.7. Ensure the units are consistent, typically in J/mol.
Calculate the change in entropy \( \Delta S \) by substituting the values of \( \Delta H_{\text{vap}} \) and \( T \) into the formula, and multiply by the number of moles (1.50 mol) to find the total entropy change for the system.
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Entropy
Entropy is a measure of the disorder or randomness in a system. In thermodynamics, it quantifies the amount of energy in a physical system that is not available to do work. When a substance changes state, such as from gas to liquid, the entropy typically decreases because the molecules become more ordered in the liquid state.
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02:46
Entropy in Thermodynamics
Heat of Vaporization
The heat of vaporization is the amount of energy required to convert a unit mass of a substance from liquid to gas at its boiling point. This value is crucial for calculating changes in entropy during phase transitions, as it directly relates to the energy absorbed or released when a substance condenses or vaporizes.
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02:19Heat Capacity
Phase Change and Temperature
Phase changes, such as condensation, occur at specific temperatures known as boiling or melting points. During these transitions, the temperature remains constant while the substance changes state. Understanding the normal boiling point of diethyl ether (34.6 °C) is essential for calculating the entropy change, as it indicates the conditions under which the phase change occurs.
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01:46Entropy in Phase Changes
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Two systems, each composed of two particles represented by circles, have 20 J of total energy. Which system, A or B, has the greater entropy? Why?
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Domanda del libro di testo
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Domanda del libro di testo
Without doing any calculations, determine the signs of ΔSsys and ΔS surr for each chemical reaction. In addition, predict under what temperatures (all temperatures, low temperatures, or high temperatures), if any, the reaction is spontaneous. a. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) ΔH°rxn = -2044 kJ
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Domanda del libro di testo
Without doing any calculations, determine the sign of ΔSsys for each chemical reaction. b. CH2=CH2( g) + H2( g) → CH3CH3( g)
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Two systems, each composed of three particles represented by circles, have 30 J of total energy. How many energetically equivalent ways can you distribute the particles in each system? Which system has greater entropy?
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