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General Chemistry Principles, Patterns, and Applications, 2011

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vapor<br />

pressure at 273 K is 3050 mmHg; ΔH vap = 18.7 kJ/mol, 1.44 kJ<br />

2.<br />

3. 12.5°C<br />

4.<br />

5. ΔH vap = 28.9 kJ/mol, n-hexane<br />

6.<br />

7. ΔH vap = 7.81 kJ/mol, 36°C<br />

[1] For a review of natural logarithms, refer to Essential Skills 6 in Section 11.9 "Essential Skills<br />

6".<br />

11.5 Changes of State<br />

L E A R N I N G O B JE C T I V E<br />

1. To calculate the energy changes that accompany phase changes.<br />

We take advantage of changes between the gas, liquid, <strong>and</strong> solid states to cool a drink with ice cubes (solid<br />

to liquid), cool our bodies by perspiration (liquid to gas), <strong>and</strong> cool food inside a refrigerator (gas to liquid<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

1025

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