
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Transcribed Image Text:Molecular weight data for a polymer sample are given below. Find the number-average (Mn) and
weight-average (MW) molecular weights. Assume a uniform distribution of molecular weights in
each range.
Molecular-weight data for polymer sample
Molecular weight range (g/mol)
Mw
=
10,000-20,000
20,000-30,000
Wi (%)
18
23
30,000-40,000
25
40,000-50,000
19
50,000-60,000
g/mol
Mn
=
g/mol
15
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