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<p>almost always appear as mixtures of molecules of multiple molar masses, each of which could be considered a separate chemical substance. However, the polymer may be defined by a known precursor or reaction(s) and the <a href="page.php?w=molar_mass_distribution">molar mass distribution</a>. For example, <a href="page.php?w=polyethylene">polyethylene</a> is a mixture of very long chains of -CH<sub>2</sub>- repeating units, and is generally sold in several molar mass distributions, <a href="page.php?w=LDPE">LDPE</a>, <a href="page.php?w=MDPE">MDPE</a>,</p><p>
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