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Meen 222- Quiz 3 - The fullerenes are a recentlydiscovered...

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The fullerenes are a recently- discovered family of carbon allotropes in the form of a hollow sphere, ellipsoid, or tube that are named after Buckminster Fuller. Richard Buckminster ("Bucky") Fuller (July 12, 1895 – July 1, 1983) was an American visionary, designer, architect, poet, author, and inventor. Throughout his life, Fuller was concerned with the question of whether humanity has a chance to survive lastingly and successfully on planet Earth, and if so, how. MEEN 222 – 503 Fall 2008 Quiz #3 Student: ________________________________________________________ Print First and Last Name
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1. (a) Compute the repeat unit molecular weight of polypropylene. (b) Compute number average molecular weight for the polypropylene for which the degree of polymerization is 15,000. (a) The repeat unit molecular weight of polypropylene is called for in this portion of the problem. For polypropylene, from Table 14.3, each repeat unit has three carbons and six hydrogens. Thus, m = 3( A C ) + 6( A H ) = (3)(12.01 g/mol) + (6)(1.008 g/mol) = 42.08 g/mol (b) We are now asked to compute the number-average molecular
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