Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Question
Chapter 20, Problem 21P
Interpretation Introduction
Interpretation:
A detailed description about C3 and C4 mechanisms would be necessary to make a comparison between them.
Concept introduction:
Photosynthesis is the process by which plants store energy from sunlight as chemical energy.The process happens in the chloroplast of a plant cell.There are two mechanisms by which the plants fixes CO2, that is, C3 and C4 cycle. Each green plant uses one of these two mechanisms.
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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…
Chapter 20 Solutions
Biochemistry
Ch. 20 - Prob. 1PCh. 20 - Prob. 2PCh. 20 - Prob. 3PCh. 20 - Prob. 4PCh. 20 - Prob. 5PCh. 20 - Prob. 6PCh. 20 - Prob. 7PCh. 20 - Prob. 8PCh. 20 - Prob. 9PCh. 20 - Prob. 10P
Ch. 20 - Prob. 11PCh. 20 - Prob. 12PCh. 20 - Prob. 13PCh. 20 - Prob. 14PCh. 20 - Prob. 15PCh. 20 - Prob. 16PCh. 20 - Prob. 17PCh. 20 - Prob. 18PCh. 20 - Prob. 19PCh. 20 - Prob. 20PCh. 20 - Prob. 21PCh. 20 - Prob. 22PCh. 20 - Prob. 23PCh. 20 - Prob. 24PCh. 20 - Prob. 25PCh. 20 - Prob. 26PCh. 20 - Prob. 27PCh. 20 - Prob. 28PCh. 20 - Prob. 29PCh. 20 - Prob. 30PCh. 20 - Prob. 31PCh. 20 - Prob. 32PCh. 20 - Prob. 33PCh. 20 - Prob. 34PCh. 20 - Prob. 35PCh. 20 - Prob. 36PCh. 20 - Prob. 37PCh. 20 - Prob. 38PCh. 20 - Prob. 39PCh. 20 - Prob. 40PCh. 20 - Prob. 41PCh. 20 - Prob. 42PCh. 20 - Prob. 43PCh. 20 - Prob. 44PCh. 20 - Prob. 45PCh. 20 - Prob. 46PCh. 20 - Prob. 47PCh. 20 - Prob. 48P
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