Diaphragm cells are frequently calibrated

Assignment Help Other Subject
Reference no: EM13189340

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. 

Reference no: EM13189340

Questions Cloud

Design an algorithm to find the selling price : To make a profit, the prices of the items sold in a furniture store are marked up by 60%. Design an algorithm to find the selling price of an item sold at the furniture store. What information do you need to find the selling price?
What is the direct labor rate variance? : The following data relate to direct labor costs for the current period:
What range of payments will the beekeeper accept : Assuming that the beekeeper gets that amount, what range of payments will the farmer accept (Remember that negative payments are also possible.) Answer the same questions for the fifth day.
Write the symbolic logic for the 3des decryption : How would you protect the passwords on your system using some of the mechanisms we have studied? Discuss implementation strategies and explain your decisions.
Diaphragm cells are frequently calibrated : 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 thi..
Define the tactics of one terrorist group : Define the tactics of one terrorist group from the following list: al Qaeda, Hezbollah, Hamas, the Islamic Brotherhood, or the IRA. Provide two examples of attacks carried out by this terrorist organization.
Determine the amount in the fund immediately : Five annual deposits in the amounts of ($1,200, $1,000, $800, $600, and $400) are made into a fund that pays interest at a rate of 9% compounded annually. Determine the amount in the fund immediately after the 5th deposit
Is a supply shift from s1 to s2 consistent : A "run on gasoline" occurs when consumers' fears of gas shortages in the future lead them to demand more gasoline now. Using supply and demand analysis, which of the following is consistent with this situation
Chief motivations of european voyages of discovery : What were the chief motivations of European voyages of discovery, and what, can we say, was/were Columbus' destination(s)?

Reviews

Write a Review

 

Other Subject Questions & Answers

  Development of which type of society

The birth of the discipline of sociology took place during the development of  which type of society?

  Abnormally dangerous activities liability

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.

  Functions of renin and angiotensin II

Which one of the following are the main functions of renin and angiotensin II.

  Principles of test administration

Could someone please help me understand the following: a) Principles of test administration, scoring, and interpretation.

  Physical or cognitive issues-retirement

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.

  Theory of cognitive functioning

Explain how the results of "The Nun Study" are substantiated by the "Use It or Lose It" theory of cognitive functioning.

  Ethical system or code

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.

  Suitable way to approach classmate about plagiarized matter

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?

  Contemporary management theory

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.

  Challenges of peer review of dnp

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).

  Terms of the influence currency model

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.

  Concepts from vygotsky theory

Name three concepts from Vygotsky's theory and give examples of how they could help to raise your ZPD in learning.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd