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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 cm2/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 cm3 and (lower) 40.8 cm3; 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 cm2/s.
The birth of the discipline of sociology took place during the development of which type of society?
Persons who engage in abnormally dangerous activities such as crop dusting or blasting: Are liable only if all the elements of negligence are proven against them.
Which one of the following are the main functions of renin and angiotensin II.
Could someone please help me understand the following: a) Principles of test administration, scoring, and interpretation.
What are some physical or cognitive issues older adults face as one enters retirement? What issues come with aging? What issues that can be avoided if older adults take better care of themselves. Give examples. Pls answer in 130 words or less.
Explain how the results of "The Nun Study" are substantiated by the "Use It or Lose It" theory of cognitive functioning.
Critically analyze any ethical system or code (for example, a religious code, or a code or system employed in business or any of the professions) and show how each of the dos and don'ts of this code apply to the various aspects of morality.
What would be suitable way to approach the classmate about concerns? What suggestions could you offer and what tools would you suggest to assist that classmate avoid plagiarism?
What other historical management theories were affected by this "first step" looking at the need to assess human motivation and behavior? Through research, relate your answer to one contemporary management theory.
Assessing professional competence and knowledge through peer-review and self-assessment are inherent parts of any professional role including the Doctor of Nursing Practice (DNP).
Identify an important relationship (co-worker, boss, friend) in which you are having trouble gaining cooperation. Access this relationship in terms of the influence currency model.
Name three concepts from Vygotsky's theory and give examples of how they could help to raise your ZPD in learning.
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