Molecular weight distribution data for a polytetrafluoroethylene material is plotted on the basis of (a) number fraction, and (b) weight fraction in the Figure below. Then, please (i) evaluate the number-average molecular weight (ii) evaluate the weight-average molecular weight (iii) comment on whether it is possible to heat up and reuse polytetrafluoroethylene 0.275- 0275- 0.25 0.250- 0.250- 0.24 0.23 0.22 0.225 0.225 0.200- 0200- 0.175- 0.175- 0.160- 0.150- 0.125- 0.125- 0.100- 0.100 0,075- 0.075 0.050- 0.050- 0.025- 0.025 0.000 0.000 Number Fraction 0.03 10 0.00 20 0.15 0.14 0.00 40 50 60 70 30 Molecular Weight (10 g/mol) (a) 0.04 80 90 Weight Fraction 0.04 0.01 10 20 0.11 0.18 0.12 30 40 50 60 70 Molecular Weight (10³ g/mol) (b) 0.07 80 90

Molecular weight distribution data for a polytetrafluoroethylene material is plotted on the basis of (a) number fraction, and (b) weight fraction in the Figure below. Then, please (i) evaluate the number-average molecular weight (ii) evaluate the weight-average molecular weight (iii) comment on whether it is possible to heat up and reuse polytetrafluoroethylene 0.275- 0275- 0.25 0.250- 0.250- 0.24 0.23 0.22 0.225 0.225 0.200- 0200- 0.175- 0.175- 0.160- 0.150- 0.125- 0.125- 0.100- 0.100 0,075- 0.075 0.050- 0.050- 0.025- 0.025 0.000 0.000 Number Fraction 0.03 10 0.00 20 0.15 0.14 0.00 40 50 60 70 30 Molecular Weight (10 g/mol) (a) 0.04 80 90 Weight Fraction 0.04 0.01 10 20 0.11 0.18 0.12 30 40 50 60 70 Molecular Weight (10³ g/mol) (b) 0.07 80 90

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter8: Sampling, Standardization, And Calibration

Section: Chapter Questions

Problem 8.20QAP

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