15) please choose correct drawing/drawing for thermoset polymers: (5 pts) (e) no

Question

15) please choose correct drawing/drawing for thermoset polymers: (5 pts) (e) none of above 13) Polyethylene has the molecular formula (C2H4). After forming by an addition reaction, the sample is analyzed; it is found that 20 mole% of the sample are (C2H4)1000, and 40 mole% of the sample (C2H4)4000 and 40 mole% of the sample are (C2H5)5000. (Note: usually a sample is divided into many finer sections, this is just a simplification to make the question easier for the exam). The atomic weights of C, H are 12.0 and 1.0 g/mole, respectively. Calculate the number average molecular weight. (5 pts) (e) none of above, the correct answer is . 13) Please calculate mass average molecular weight of the polymer above. (5 pts) (a) 106.4 kg/mol (b) 126.4 kg/mol (c) 86.4 kg/mol (d) 146.4 kg/mol (e) none of above, the correct answer is .

Explanation / Answer

12. B

http://www.personal.kent.edu/~cearley/ChemWrld/polymers/polyethylene.png

13. A

check weights in http://www.webqc.org/mmcalc.php

14. A

http://www.green-planet-solar-energy.com/images/plastic-production-1.gif

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