Domanda del libro di testo
The lattice energy of CsF is -744 kJ/mol, whereas that of BaO is -3029 kJ/mol. Explain this large difference in lattice energy.
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Ch.9 - Chemical Bonding I: The Lewis Model
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving136
- Ch.2 - Atoms & Elements112
- Ch.3 - Molecules, Compounds & Chemical Equations159
- Ch.4 - Chemical Quantities & Aqueous Reactions140
- Ch.5 - Gases118
- Ch.6 - Thermochemistry106
- Ch.7 - Quantum-Mechanical Model of the Atom62
- Ch.8 - Periodic Properties of the Elements103
- Ch.9 - Chemical Bonding I: The Lewis Model104
- Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory89
- Ch.11 - Liquids, Solids & Intermolecular Forces73
- Ch.12 - Solids and Modern Material59
- Ch.13 - Solutions110
- Ch.14 - Chemical Kinetics140
- Ch.15 - Chemical Equilibrium78
- Ch.16 - Acids and Bases155
- Ch.17 - Aqueous Ionic Equilibrium176
- Ch.18 - Free Energy and Thermodynamics108
- Ch.19 - Electrochemistry118
- Ch.20 - Radioactivity and Nuclear Chemistry82
- Ch.21 - Organic Chemistry150
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Capitolo 9, Problema 47
Use the Born–Haber cycle and data from Appendix IIB, Chapter 8 and this chapter to calculate the lattice energy of KCl. (ΔHsub for potassium is 89.0 kJ/mol.)
Guida verificata passo dopo passo1
Identify the steps involved in the Born–Haber cycle for KCl, which include sublimation of potassium, ionization of potassium, dissociation of chlorine, electron affinity of chlorine, and formation of KCl from gaseous ions.
Write the equation for the sublimation of potassium: \( \text{K(s)} \rightarrow \text{K(g)} \) with \( \Delta H_{\text{sub}} = 89.0 \text{ kJ/mol} \).
Write the equation for the ionization of gaseous potassium: \( \text{K(g)} \rightarrow \text{K}^+(g) + e^- \) and use the ionization energy from the appendix.
Write the equation for the dissociation of chlorine: \( \frac{1}{2} \text{Cl}_2(g) \rightarrow \text{Cl}(g) \) and use the bond dissociation energy from the appendix.
Write the equation for the electron affinity of chlorine: \( \text{Cl}(g) + e^- \rightarrow \text{Cl}^-(g) \) and use the electron affinity value from the appendix.
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Born-Haber Cycle
The Born-Haber cycle is a thermodynamic cycle that relates the lattice energy of an ionic compound to other measurable quantities. It involves several steps, including the sublimation of the metal, ionization energy, electron affinity, and the formation of the ionic solid from gaseous ions. This cycle allows for the calculation of lattice energy by applying Hess's law, which states that the total enthalpy change for a reaction is the sum of the enthalpy changes for each step.
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03:49
Born Haber Cycle
Lattice Energy
Lattice energy is the energy released when gaseous ions combine to form an ionic solid, or the energy required to separate one mole of an ionic solid into its gaseous ions. It is a measure of the strength of the forces between the ions in an ionic compound. Higher lattice energy indicates stronger ionic bonds, which typically results in higher melting points and greater stability of the compound.
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00:49Lattice Energy
Enthalpy Changes
Enthalpy changes refer to the heat content changes during a chemical reaction or phase change at constant pressure. In the context of the Born-Haber cycle, various enthalpy changes such as sublimation, ionization energy, and electron affinity are used to calculate the overall lattice energy. Understanding these individual enthalpy changes is crucial for accurately applying the Born-Haber cycle to determine the lattice energy of ionic compounds.
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02:34Enthalpy of Formation
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Domanda del libro di testo
Use the Born–Haber cycle and data from Appendix IIB and Table 9.3 to calculate the lattice energy of CaO. (ΔHsub for calcium is 178 kJ/mol; IE1 and IE2 for calcium are 590 kJ/mol and 1145 kJ/mol, respectively; EA1 and EA2 for O are -141 kJ/mol and 744 kJ/mol, respectively.)
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Domanda del libro di testo
Write the Lewis structure for each molecule. a. PH3 b. SCl2 c. HI
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Domanda del libro di testo
Rubidium iodide has a lattice energy of -617 kJ/mol, while potassium bromide has a lattice energy of -671 kJ/mol. Why is the lattice energy of potassium bromide more exothermic than the lattice energy of rubidium iodide?
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