CHEM163B_HW3_solutions_2011

CHEM163B_HW3_solutions_2011 - Winter 2011 Chemistry 163B...

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Winter 2011 Chemistry 163B 1 Homework #3 Problems (#16-#19) 16. E&R #4.20 [for part b. use Appendix A (4.1) only; no peeking at A(4.2) !!] 17. (from Physical Chemistry: Principles and Applications in Biological Sciences , by Tinoco, Sauer, Wang, Puglisi, published by Prentice Hall). Photosynthesis can produce 20kg of carbohydrate (e.g. sucrose) per hectare per hour in bright sunlight. Using the following ‘model reaction: (g) O 12 (s) O H C ) ( O H 11 (g) CO 12 2 11 22 12 2 2 ! " ! l chlorophyl light ± a. What is the enthalpy change associated with the production of 1 mol of sucrose from carbon dioxide and water? b. Assume that photosynthesis can yield 20kg of sucrose per hectare per hour (5.56 # 10 -4 g m -2 s -1 ). If sunlight strikes the earth with power 10 3 Wm -2 , what fraction of this light energy is “stored” as sucrose by photosynthesis (W=watt)? 18. The fermentation of sugar by yeast is one of the oldest chemical processes utilized by homo sapiens . (g) 2CO ) ( OH H 2C (s) O H C 2 5 2 yeast 6 12 6 ! $ $" $ ± a. Use the data in Appendix A to calculate % Hº for fermentation of 1 mole of & -D-glucose at 25º C . b. If the fermentation reaction was carried out by a thermophilic bacterium at 80º C, what would be % H for 1 mole of & -D-glucose (assume temperature
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This note was uploaded on 03/16/2011 for the course CHEM 163B taught by Professor Geneswitkes during the Spring '11 term at UCSC.

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CHEM163B_HW3_solutions_2011 - Winter 2011 Chemistry 163B...

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