2006 - questions

2006 - questions - QUESTIONS Answer Question 1 4 and either...

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QUESTIONS Answer Question 1 → 4 and either 5(a) or 5(b) 1. Calculate a value for the C=O double bond energy from data provided on the exam. (15) Point out any assumptions that are made 2. (a) Given the experimental C P values obtained at 298K for the molecules below, calculate the vibrational contribution at 298K as a percent of the vibrational contribution at the “H-T limit”. (10) C p (J mol -1 K -1 ) 19 F 2 (g) 31.3 CH≡CH(g) 43.9 31 P 35 CL 5 (g) 71.8 CO 2 (g) 37.1 C 6 H 6 (g) 80.7 (b) Account for the highest and lowest percentage of vibrational contribution at 298K 3. (a) The hydrolysis of a sample of a 0.25M solution of phosphoenolpyruvate (PEP) to yield pyruvate (Pyr) and phosphate is catalyzed with an enzyme in a small adiabatic calorimeter. The temperature of the aqueous solution changes from 23.4 → 27.4 o C during the reaction. Calculate the H hydrolysis per mole of PEP. (10) (b) In a reaction catalyzed by pyruvate kinase the conversion of phosphoenolpyruvate → pyruvate is coupled to the formation of ATP: PEP + ADP → Pyr + ATP Calculate the fraction of the H hydrolysis determined for PEP in part (a) that is captured in the formation of ATP in the reaction above. (Assume the
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2006 - questions - QUESTIONS Answer Question 1 4 and either...

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