Biochemistry
8th Edition
ISBN: 9781285429106
Author: Campbell, Mary K., FARRELL, Shawn O.
Publisher: Cengage Learning,
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Chapter 20, Problem 27RE
REFLECT AND APPLY Why do the electron-transfer reactions of the cytochromes differ in standard reduction potential, even though all the reactions involve the same oxidation–reduction reaction of iron?
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1. (10 points) Pulverized coal pellets, which may be
°
approximated as carbon spheres of radius r = 1 mm, are
burned in a pure oxygen atmosphere at 1450 K and 1 atm.
Oxygen is transferred to the particle surface by diffusion, where
it is consumed in the reaction C + O₂ →> CO₂. The reaction rate
is first order and of the form No2 = k₁C₁₂(r), where k₁ = 0.1 m/s.
Neglecting changes in r, determine the steady-state O₂ molar
consumption rate in kmol/s. At 1450 K, the binary diffusion
coefficient for O2 and CO2 is 1.71 x 10ª m²/s.
2. (20 points) Consider combustion of hydrogen gas in a mixture
of hydrogen and oxygen adjacent to the metal wall of a
combustion chamber. Combustion occurs at constant
temperature and pressure according to the chemical reaction
2H₂+ O₂→ 2H₂O. Measurements under steady-state conditions
at 10 mm from the wall indicate that the molar concentrations
of hydrogen, oxygen, and water vapor are 0.10, 0.10, and 0.20
kmol/m³, respectively. The generation rate of water vapor is
0.96x102 kmol/m³s throughout the region of interest. The binary
diffusion coefficient for each of the species (H, O̟, and H₂O) in
the remaining species is 0.6 X 10-5 m²/s.
(a) Determine an expression for and make a qualitative plot
of C as a function of distance from the wall.
H2
(b) Determine the value of C2 at the wall.
H2
(c) On the same coordinates used in part (a), sketch curves
for the concentrations of oxygen and water vapor. This will
require you to calculate Co, and C.
02
H20
(d) What is the molar flux of water…
4. (15 points) Consider a spherical organism of radius ro within
which respiration occurs at a uniform volumetric rate of That is,
oxygen (species A) consumption is governed by a first- order
reaction, homogeneous chemical reaction.
a. If a molar concentration of CA(ro) = CA,o is maintained at
the surface of the organism, obtain an expression for the
radial distribution of oxygen, CA(r), within the organism.
Hint: To simplify solution of the species diffusion equation,
invoke the transformation y = rCA.
b. Obtain an expression for the rate of oxygen consumption
within the organism.
c. Consider an organism of radius ro = 0.10 mm and a
diffusion coefficient of DAB = 108 m2/s. If CA, o = 5 x105
kmol/m3 and k1 20 s1, estimate the corresponding value
of the molar concentration at the center of the organism.
What is the rate of oxygen consumption by the organism?
Chapter 20 Solutions
Biochemistry
Ch. 20 - RECALL Briefly summarize the steps in the electron...Ch. 20 - RECALL Are electron transport and oxidative...Ch. 20 - Prob. 3RECh. 20 - REFLECT AND APPLY Show how the reactions of the...Ch. 20 - REFLECT AND APPLY How does mitochondrial structure...Ch. 20 - Prob. 6RECh. 20 - Prob. 7RECh. 20 - MATHEMATICAL Using the information in Table 20.2,...Ch. 20 - Prob. 9RECh. 20 - Prob. 10RE
Ch. 20 - MATHEMATICAL Calculate E for the following...Ch. 20 - Prob. 12RECh. 20 - MATHEMATICAL Which is more favorable...Ch. 20 - REFLECT AND APPLY Comment on the fact that the...Ch. 20 - RECALL What do cytochromes have in common with...Ch. 20 - RECALL How do the cytochromes differ from...Ch. 20 - RECALL Which of the following does not play a role...Ch. 20 - Prob. 18RECh. 20 - Prob. 19RECh. 20 - REFLECT AND APPLY Two biochemistry students are...Ch. 20 - REFLECT AND APPLY Cytochrome oxidase and...Ch. 20 - Prob. 22RECh. 20 - REFLECT AND APPLY Reflect on the evolutionary...Ch. 20 - REFLECT AND APPLY Experimental evidence strongly...Ch. 20 - Prob. 25RECh. 20 - REFLECT AND APPLY What is the advantage of having...Ch. 20 - REFLECT AND APPLY Why do the electron-transfer...Ch. 20 - Prob. 28RECh. 20 - Prob. 29RECh. 20 - Prob. 30RECh. 20 - RECALL Describe the role of the F1 portion of ATP...Ch. 20 - Prob. 32RECh. 20 - Prob. 33RECh. 20 - Prob. 34RECh. 20 - REFLECT AND APPLY What is the approximate P/O...Ch. 20 - REFLECT AND APPLY Why is it difficult to determine...Ch. 20 - REFLECT AND APPLY What are some of the...Ch. 20 - RECALL Briefly summarize the main arguments of the...Ch. 20 - Prob. 39RECh. 20 - Prob. 40RECh. 20 - Prob. 41RECh. 20 - Prob. 42RECh. 20 - REFLECT AND APPLY Criticize the following...Ch. 20 - Prob. 44RECh. 20 - Prob. 45RECh. 20 - Prob. 46RECh. 20 - RECALL How does the yield of ATP from complete...Ch. 20 - REFLECT AND APPLY The malate-aspartate shuttle...Ch. 20 - MATHEMATICAL What yield of ATP can be expected...Ch. 20 - MATHEMATICAL The free-energy change (G) for the...
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