(a) Interpretation: The compound should be identified using the following proton NMR spectra whose empirical formula is C 8 H 10 : Concept introduction: Proton NMR is application of nuclear magnetic resonance with respect to 1 H nuclei in molecules in order to determine structure. Protons that are in the same magnetic environment are considered as chemically equivalent protons.

Question

(a) Show that the lattice energies are inversely proportional to the distance between ions in MX (M = alkali metal, X = halide ions) by plotting the lattice energies of KF, KCl, and KI against the internuclear distances, dMX. The lattice energies of KF, KCl, and KI are 826, 717, and 645 kJ/mol, respectively. Does the correlation obtained correlate well? You will need to use a standard graphing program to construct the graph (such as a spreadsheet program). It will generate an equation for the line and calculate a correlation coefficient. (b) Estimate the lattice energy of KBr from your graph. (c) Find an experimental value for the lattice energy of KBr in the literature, and compare this value with the one calculated in (b). Do they agree?

Answer 1

Question

Chapter 19, Problem 19.35QAP

Interpretation Introduction

(a)

Interpretation:

The compound should be identified using the following proton NMR spectra whose empirical formula is C₈H₁₀:

Concept introduction:

Proton NMR is application of nuclear magnetic resonance with respect to ¹H nuclei in molecules in order to determine structure. Protons that are in the same magnetic environment are considered as chemically equivalent protons.

Interpretation Introduction

(b)

Interpretation:

The compound should be identified using the following proton NMR spectra whose empirical formula is C₈H₁₀:

Concept introduction:

Proton NMR is application of nuclear magnetic resonance with respect to ¹H nuclei in molecules in order to determine structure. Protons that are in the same magnetic environment are considered as chemically equivalent protons.

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(a) Show that the lattice energies are inversely proportional to the distance between ions in MX (M = alkali metal, X = halide ions) by plotting the lattice energies of KF, KCl, and KI against the internuclear distances, dMX. The lattice energies of KF, KCl, and KI are 826, 717, and 645 kJ/mol, respectively. Does the correlation obtained correlate well? You will need to use a standard graphing program to construct the graph (such as a spreadsheet program). It will generate an equation for the line and calculate a correlation coefficient. (b) Estimate the lattice energy of KBr from your graph. (c) Find an experimental value for the lattice energy of KBr in the literature, and compare this value with the one calculated in (b). Do they agree?

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