Statistics for Engineers and Scientists
4th Edition
ISBN: 9780073401331
Author: William Navidi Prof.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 8, Problem 12SE
The article “Enthalpies and Entropies of Transfer of Electrolytes and Ions from Water to Mixed Aqueous Organic Solvents” (G. Hefter, Y. Marcus, and W. Waghorne, Chemical Reviews, 2002:2773–2836) presents measurements of entropy and enthalpy changes for many salts under a variety of conditions. The following table presents the results for entropies of transfer (in J/K · mol) from water to water + methanol of NaCl (table salt) over a
Concentration (%) | Entropy |
5 | 1 |
10 | –1 |
20 | –7 |
30 | –17 |
40 | –28 |
50 | –39 |
60 | –52 |
70 | –65 |
80 | –80 |
90 | –98 |
100 | –121 |
- a. Fit polynomial models of degrees 1. 2. and 3 to predict the entropy (y) from the concentration (x).
- b. Which degree polynomial is the most appropriate? Explain.
- c. Using the most appropriate model, find 99% confidence intervals for the coefficients.
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The article "Enthalpies and Entropies of Transfer of Electrolytes and Ions from Water to
Mixed Aqueous Organic Solvents" (G. Hefter, Y. Marcus, and W. Waghome, Chemical
Reviews, 2002-2773-2836) presents measurements of entropy and enthalpy
changes for many salts under a variety of conditions. The following table presents
the results for enthalpy of transfer (in kJ/mol) from water to water + methanol of NaCi
(table salt) for several concentrations of methanol. Four independent measurements were
made at each concentration.
Concentration (%)
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3.52
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a Is it plausible that the enthalpy is the same at all concentrations? Explain.
b. Which pairs of concentrations, if any, can you conclude to have differing enthalpies?
Chapter 8 Solutions
Statistics for Engineers and Scientists
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