Physical Chemistry
Physical Chemistry
3rd Edition
ISBN: 9780321812001
Author: ENGEL, Thomas/ Reid
Publisher: Pearson College Div
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Chapter 4, Problem 4.6NP
Interpretation Introduction

Interpretation:

A formula for the standard enthalpy of formation at temperature T for the reaction:

  CO(g) + 1/2O2(g)  CO2(g) , needs to be derived.

Concept Introduction:

The standard enthalpy change for a reaction ΔH0 is given in terms of the difference in the standard enthalpy of formation of the products and that of reactants.

i.e. ΔH0 = npΔHf0(products) - nrΔHf0(reactants)  ------(1)

np and nr are the number of moles of the products and reactants

The enthalpy of formation at temperature T is related to the standard enthalpy of formation at 298 K by the following equation:

  ΔHf0(T) = ΔHf0(298K) + 298T ΔCpdT ------(2)where ΔCp=Cp(products)Cp(reactants) i.e. the difference in the heatcapacities of the products and reactants

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Done 11:14 ⚫ worksheets.beyondlabz.com 5 (a). Using the peak information you listed in the tables for both structures, assign each peak to that portion of the structure that produces the peak in the NMR spectrum. Draw this diagram on your own sheet of paper and attach the sketch of your drawing to this question. Question 6 5 (b). Using the peak information you listed in the tables for both structures, assign each peak to that portion of the structure that produces the peak in the NMR spectrum. Draw this diagram on your own sheet of paper and attach the sketch of your drawing to this question. Question 7 6. Are there any differences between the spectra you obtained in Beyond Labz and the predicted spectra? If so, what were the differences? <
2. Predict the NMR spectra for each of these two compounds by listing, in the NMR tables below, the chemical shift, the splitting, and the number of hydrogens associated with each predicted peak. Sort the peaks from largest chemical shift to lowest. **Not all slots must be filled** Peak Chemical Shift (d) 5.7 1 Multiplicity multiplate .......... 5.04 double of doublet 2 4.98 double of doublet 3 4.05 doublet of quartet 4 5 LO 3.80 quartet 1.3 doublet 6 Peak Chemical Shift (d) Multiplicity
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