PL%20Worksheet%20130

PL%20Worksheet%20130 - Formation, H f . The formula was the...

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PL Worksheet 13 20.1 Spontaneity 1. Define the term spontaneous change . 2. Give an example of a spontaneous change. 3. On page 884 of your text, the book discusses the term microstates. In your own words, describe what is meant by microstates. Describe a sample that would have very few microstates and describe a sample that would have very many microstates. 4. Describe the relationship between the number of microstates and the entropy of a sample. 5. Make predictions for each of the following as far as whether the process would increase or decrease entropy: A) Liquid water on a stove is evaporated. B) 2.00 mol of NO 2 gas is combined to form 1.00 mol of N 2 O 4 gas C) Spilled salt crystals are placed into one pile D) All the leaves on a tree fall off 20.2 Change in Entropy 6. In General Chemistry I, you calculated the H of a reaction by using values for the Heats of
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Unformatted text preview: Formation, H f . The formula was the products minus reactants, and coefficients were used as multipliers. You can perform the same operation to find the change in entropy of a reaction. The only difference, entropy is described with S and each compound is described with S . Solve for the S of each reaction below: Compound S Compound S I 2 ( s ) 116.14 I 2 ( g ) 260.58 I ( aq ) 109.40 LiI ( s ) 85.80 NO 2 ( g ) 239.9 Li + ( aq ) 14 N 2 O 4 ( g ) 304.3 Li + ( aq ) + I ( aq ) LiI ( s ) I 2 ( s ) I 2 ( g ) 2 NO 2 ( g ) N 2 O 4 ( g ) 7. Did you answer to the last reaction in number 6 match your prediction in question 5B? 8. Does a positive sign for entropy mean more microstates are possible or fewer? Use an answer from question 6 to support your answer....
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This note was uploaded on 11/29/2011 for the course CHEM 1212 taught by Professor Dockery during the Fall '08 term at Kennesaw.

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PL%20Worksheet%20130 - Formation, H f . The formula was the...

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