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Get Full Access to Atkins' Physical Chemistry - 11 Edition - Chapter 13c - Problem P13c.9
Get Full Access to Atkins' Physical Chemistry - 11 Edition - Chapter 13c - Problem P13c.9

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ISBN: 9780198769866 2042

## Solution for problem P13C.9 Chapter 13C

Atkins' Physical Chemistry | 11th Edition

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Atkins' Physical Chemistry | 11th Edition

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Problem P13C.9

Deduce an expression for the root mean square energy, $$\left\langle\varepsilon^{2}\right\rangle^{1 / 2}$$, in terms of the partition function and hence an expression for the root mean square deviation from the mean, $$\Delta \varepsilon=\left(\left\langle\varepsilon^{2}\right\rangle-\langle\varepsilon\rangle^{2}\right)^{1 / 2}$$. Evaluate the resulting expression for a harmonic oscillator. Hint: Use $$\left\langle\varepsilon^{2}\right\rangle=(1 / q) \sum_{j} \mathrm{e}^{-\beta \varepsilon_{j}} \varepsilon_{j}^{2}$$.

Text Transcription:

langle varepsilon^2 rangle^½

Delta varepsilon=(langle varepsilon^2 rangle-langle varepsilon rangle^2)^1/2}

langle varepsilon^2 rangle=(1/q) sum_j e^-beta varepsilon_j varepsilon_j^2

Step-by-Step Solution:
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Chapter 4: Chemical bonding Key: Chemical: chem moles: mol negative: neg molecule: molec ­ Electrons: e different: diff positive: pos Formal Charge: FC ­ Numbers: # three­dimensional: 3D Valence electrons: ve With: w/ Gas: (g) structure: struct I. Chemical bonds  3 basic types of chem bonds ­ Ionic: electrostatic attractions between ions ­ ­ Covalent: sharing of e ­ Metallic: metal atoms bonded to one another A. Ionic Compounds  Ionic compounds form when a metal cation forms w/ a nonmetal anion 1. Lewis symbols for Ionic Compounds Na (11e): 1s 2s 2p 3s  Na (10e): 1s 2s 2p 2 2 6 ­ 2 2 6 2 5 ­ ­ 2 2 6 2 6 Cl (17e): 1s 2s 2p 3s 3p  Cl (18e): 1s 2s 2p 3s 3p 2. Electrostatic Potential Energy Coulombic Attraction Eel= 2.31 x1

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