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Urea with formula structure of (NH2)2CO is diffusing very slowly in water solution at 31 oC to
develop the hydrolysis of urea into carbon dioxide and ammonia. The urea solution was produced
through the active site with the protein binding (MW = 726 300) containing 21 g protein/200 mL
solution and form a tetrahedral cluster that fills the cavity site through hydrogen bonds.Compare the diffusivity coefficient for urea solution at 31 oC using Stokes-Einstein and
Wilke-Chang methods.
2A = 3R + S
Time (h)
0
0.5
1.5
3
4
7
13
Concentration of
A (mol/lt)
0.2
0.181
0.155
0.131
0.12
0.099
0.077
Determine:
A) The reaction order and the reaction rate coefficient
B) The time to react 90% conversion
C) If the activation energy is 10,800 kj/mol, calculate the half-life
time at 60 C.
2A = 3R + S
Time (h)
0
0.5
1.5
3
4
7
13
Concentration of
A (mol/lt)
0.2
0.181
0.155
0.131
0.12
0.099
0.077
Determine:
A) The reaction order and the reaction rate coefficient
B) The time to react 90% conversion
C) If the activation energy is 10,800 kj/mol, calculate the half-life
time at 60 C.
21.What are the different concentration scales to measure air pollutants in the atmosphere?
20. What is nutrient cycles, explain briefly?
19. What are the advantages of open dumping disposal process?
18.What are the advantages of the bag filter?
17.The environmental lapse rate is 10°C/ 1000 meter, if the ground temperature is 50°C. What will be the temperature (°C) at 500 meter elevation?
a) 40 b) 45 c) 50
d) 55
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#340153 on Dec 2023