Chem Written Assignment 9 graded .docx - Thomas Edison...

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Thomas Edison State College General Chemistry II with Labs (CHE-122) Section No.: Written Assignment 9: Spontaneity Reactions October 2015 Written Assignment 9: Spontaneity Reactions 80/100 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. a. From more ordered to more disordered. Increases b. From more disordered to more ordered. Decreases c. From ordered to disordered. Increases d. From disordered to ordered. Decreases e. From disordered to ordered. Decreases f. From ordered to disordered. Increases g. From ordered (solid) to disordered (solvated). Increases. 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 ) a. Li( s ) has a lesser entropy value than Li( l ). In the liquid phase, molecules have intermolecular spaces that are less than solid. b. CH 3 OCH 3 ( l ) has a greater entropy value than C 2 H 5 OH( l ) since C 2 H 5 OH could form hydrogen bonding.
c. Xe( g ) has a greater entropy value than Ar( g

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