Question

9. The kinetics of the oxidation of ferrodoxin by oxygen were investigated in a careful series of experiments, shown below at 25 °C. 2 Fd[Fe2+] (aq) + O2 (aq) + 2 H* (aq) 2 Fd[Fe3] H202 (aq) What was measured was the absorbance of the Fd[Fe2+] at 475 nm after exactly 1 second of reaction, in a 1-cm cuvette. The initial absorbance of the solution at 475 nm was o.095. Hint, from the decrease in A475 you can calculate how much Fd has reacted. Htlo (M 0.050 0.050 0.050 0.100 A475 after 1.00 sec 0.065 0.034 0.053 0.036 0 a. Derive the RATE LAWW b. Given that the molar absorptivity coefficient of Fd[Fe2+] at 475 nm is 1750 , calculate the RATE CONSTANT with appropriate units. mol-cm 10, (Do problem #9 first!) The kinetics of the oxidation of ferrodoxin by oxygen were investigated in a careful series of experiments, shown below 2 Fd[Fe2+] (aq) + O2 (aq) + 2 H* (aq) 2 Fd[Fe3+] H202 (aq) What was measured was the absorbance of the Fd[Fe2+] at 475 nm after exactly 1 second of reaction, in a 1-cm cuvette. The initial absorbance of the solution at 475 nm was 0.095. In each experiment, the concentration of FdFe*) was 1.5 μΜ, the oxygen concentration was 1.5 mM, and the H+ concentration was o.o50 M ("С) 2 | A475 after 1.oo sec 0.06 0.02 Calculate EA, AH', the Arrhenius Constant, and AS*.

Answer 1

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