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The heat of fusion of crystalline polyethylene is approximately 7.7 kJ/mol, and the corresponding entropy change for melting is 19 J/mol K. Use these data to estimate the melting point of polyethylene.

The heat of fusion of crystalline polyethylene is approximately 7.7 kJ/mol, and the corresponding entropy change for melting is 19 J/mol K. Use these data to estimate the melting point of polyethylene.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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1. Polymerization reactions are complicated somewhat because they involve very large numbers of molecules. But we can demonstrate the general features of the thermodynamics of polymerization by considering a much smaller model system. Instead of considering the formation of polyethylene, for example, we can begin with the following reaction in which two ethylene molecules combine with hydrogen to form butane: 2 C2H4(g) + H2(g) C4H10(g) Use the table below to calculate ASº. so Compound (J mol' K') Compound (J mol K') H;(g) 130.6 CO,(g) 213.6 0-(g) 205.0 C,H1«(g) 310.03 H,O(t) 69.91 CH,(g) 186.2 H,O(g) 188.7 C,H,(g) 219.5 NH;(g) 192.3 C,H;N(€) 178.91 2. The heat of fusion of crystalline polyethylene is approximately 7.7 kJ/mol, and the corresponding entropy change for melting is 19 J/mol K. Use these data to estimate the melting point of polyethylene.
Transcribed Image Text:1. Polymerization reactions are complicated somewhat because they involve very large numbers of molecules. But we can demonstrate the general features of the thermodynamics of polymerization by considering a much smaller model system. Instead of considering the formation of polyethylene, for example, we can begin with the following reaction in which two ethylene molecules combine with hydrogen to form butane: 2 C2H4(g) + H2(g) C4H10(g) Use the table below to calculate ASº. so Compound (J mol' K') Compound (J mol K') H;(g) 130.6 CO,(g) 213.6 0-(g) 205.0 C,H1«(g) 310.03 H,O(t) 69.91 CH,(g) 186.2 H,O(g) 188.7 C,H,(g) 219.5 NH;(g) 192.3 C,H;N(€) 178.91 2. The heat of fusion of crystalline polyethylene is approximately 7.7 kJ/mol, and the corresponding entropy change for melting is 19 J/mol K. Use these data to estimate the melting point of polyethylene.
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