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Entropy Lab - Determination of the Entropy Change April 8th...

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Determination of the Entropy Change April 8 th , 2008 Lab Section 2216 Chemistry 002 Yunyun Wu Rebecca Dermody
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Purpose : The purpose of this lab is to determine the entropy change in a reaction by calculating the free energy change and then indirectly calculating the entropy change of the reaction. Procedure: 1. Add 2.811 g urea to a 10.0 mL graduated cylinder 2. Add enough water to the graduated cylinder to dissolve urea 3. Measure total volume for the solution and calculate molarity 4. Discard solution in labeled beaker 5. Repeat steps 1-4 6. Add 50 mL water to styrofoam cup 7. Measure temperature of water every 15 seconds for 90 seconds 8. Dissolve 3.00 g urea in 50 mL water to create a 1M solution, recording temperature every 15 seconds for 90 seconds Data/Results: 50 mL Water Trial 1 Trial 2 Time (sec.) Temp. (ºC) Time (sec.) Temp. (ºC) 0 23 0 27.5 15 23 15 27.5 30 23 30 27.5 45 23 45 27.5 60 23 60 27.5 75 23 75 27.5 90 23 90 27.5 3g Urea in Water Trial 1 Trial 2 Time (sec.) Temp.
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