How does the entropy of a system change for each of the...

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Name: College ID: Thomas Edison State University General Chemistry II (CHE-112) Section no.: Semester and year: Written Assignment 9: Spontaneity Reactions Answer all assigned questions and problems, and show all work. 1. How does the entropy of a system change for each of the following processes? (14 points) a. A solid melts. b. A liquid freezes. c. A liquid boils. d. A vapor is converted to a solid. e. A vapor condenses to a liquid. f. A solid sublimes. g. Urea dissolves in water. (Reference: Chang 17.5) 2. For each pair of substances listed here, choose the one having the larger standard entropy value at 25ºC. The same molar amount is used in the comparison. Explain the basis for your choice. (12 points) a. Li( s ) or Li( l ) b. C 2 H 5 OH( l ) or CH 3 OCH 3 ( l ) c. Ar( g ) or Xe( g ) d. CO( g ) or CO 2 ( g ) e. O 2 ( g ) or O 3 ( g ) f. NO 2 ( g ) or N 2 O 4 ( g ) (Reference: Chang 17.9) 3. Using the data in Appendix 3 of the textbook, calculate the standard entropy changes for the following reactions at 25ºC. (8 points) 1 Copyright © 2017 by Thomas Edison State University. All rights reserved.

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