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1. Water vapor evaporating from a pond does so as if it were diffusing across an air film 0.15 centimeters thick. The diffusion coefficient of water vapor in 20 degrees C air is about 0.25 cm^2/sec. If the air out of the film is fifty percent saturated with water vapor, how fast will the water level drop in a day? Data: the saturation partial pressure for water vapor at 20 degrees C is 23.4 millibar (1 atm = 1.0325 bar). The molecular weight of water is 18 g/mol. Hint: assume the mixture of air and water vapor obeys the ideal gas law.2. Diaphragm cells are frequently calibrated by allowing 1 molar potassium chloride to diffuse into pure water.Your cell has compartment volumes of (upper) 42.3 cm^3 and (lower) 40.8 cm^3; the diaphragm is a glass frit 2.51 cm in diameter and 0.16 cm thick. In one calibration experiment, the concentration difference at 36 hours 6 minutes is 49.2% of that originally present.Estimate the diffusion coefficient? What is the cell's calibration constant?Assume H, the membrane partition coefficient=1.3. Consider the diffusion of dopant element A into crystalline wafer. The dopant rich coating is considered as a large source of A relevant to the amount of A diffused, so that the surface concentration CAs can be considered a constant. Determine the depth (z) of the front of diffusing dopant after two hours of diffusion. Assume that the front concentration is 2% of the surface concentration. Diffusivity of A= 6.5 X 10^-13 cm^2/s.
Brilliant Color is a small supplier of chemicals and equipment that are used by some photographic stores to process 35mm film. One product that Brilliant Color supplies is BC-6. John Kubick, president of Brilliant Color, normally stocks 11, 12, or ..
The project has been made in a gas station that belongs to Areeky Group, which is a family owned organization established to develop and carry out industrial and commercial activities in the Kingdom of Saudi Arabia.
"Many crimes involving e-mails have e-mail accounts set up in countries less willing to cooperate with the country in which the crime is being investigated. Discuss how to deal with this kind of situation.
What is the role of the school counselor for children diagnosed with ADHD? What information does the counselor need to know about ADD or ADHD
At school, Drew behaves in morally acceptable ways primarily to win approval of his teachers. Which stage of conventional reasoning does this demonstrate.
Do you believe original painting has been improved or diminished by this change in status? Describe how and give suitable examples from \ internet.
Describe agnosia? Write down the main aspects of visual (apperceptive & associative), auditory and tactile agnosias?
The Deist faith embraced all of the following except
Explain what Salisbury means when he claims that many groups have "come to Washington out of requirement and dependence rather than since they have influence." Do you agree or disagree and Why.
Describe the “Exclusionary Rule” and what it is meant to protect the citizens of this country from. ?What are the benefits of the Exclusionary Rule? Explain.? Identify at least two methods of demonstrative evidence which would the concept of “Best Ev..
Bowlby would consider Emmy to be in which stage of the development of attachment?
Which of the following is NOT a characteristic of Renaissance music:
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