Evacuating a liquid from a tank with a pressurized vapor
Solving the Problem
Common Student Questions and Comments
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1 Moving Liquids
Evacuating a liquid from a tank with a pressurized vapor
There are many ways to move fluids in chemical pr
CHE495: Two Laws, One Class
Assignment #7
Due: 5 PM, November 15, 2016
Problem 1
(30 Points)
Steam tables are wonderful constructs. Not only are they useful for energy balances, but we can relate them
to phase equilibria using the concept of the fugacity.
CHE495: Two Laws, One Class
Assignment #1
Due: 5 PM, September 19, 2016
Problem 1
(25 Points)
While solving the exercise involving R-134a in class, we required the use of reference data several times
to make progress toward the solution. In some cases, de
CHE495: Two Laws, One Class
Assignment #2
Due: 5 PM, September 26, 2016
The last homework set was based around mainly closed-type systems, such that flow terms were non-existent
at the system boundaries. In this set, youll find the application of the Firs
CHE495: Two Laws, One Class
Assignment #4
Due: 1 PM, October 14, 2016
Choose your adventure:
Complete HW04 and turn it in during class next week. Only counts toward homework scores.
Finish all the problems and hand in your solutions by 5 PM on Monday, O
CHE495: Two Laws, One Class
Assignment #3
Due: 1 PM, September 30, 2016
Problem 1
(25 Points)
An ice cube is dropped into a hot cup of coffee. As the ice cube melts, the coffee cools down. What
happens to the entropy of the coffee, the entropy of the ice
CHE495: Two Laws, One Class
Assignment #5
Due: 1 PM, October 21, 2016
Problem 1
(25 Points)
Derive an expression for calculating internal energy changes with dependent variables T and P (i.e., U (T, P ).
(A) Simplify this expression assuming we are using
CHE495: Two Laws, One Class
Assignment #6
Due: 5 PM, October 31, 2016
Problem 1
(25 Points)
For a rubber band, we can write the fundamental relation for internal energy as
dU = T dS F dL,
where F , the system force, is negative when the rubber band is und
ChE 440 / 640
Homework assignment #13 is due Wednesday, November 23, 2016
For full credit, be sure to follow the prescribed format given in the homework format
requirements, as described on WebCampus.
This assignment must be turned in at the beginning o
Midterm #2 102 A Closed Books and Closed Notes Nov 26, 2007 1. Give detail definitions (10 points) Entropy
Reversible and irreversible process
2nd Law
2. Estimate the maximum shaft work for a closed system undergoing an isothermal constant pressur
Problem #1 (10 points) For ideal gas, PV=RT
Problem #2 (30 points) (1)Tf =Ti(Pf/Pi)R/Cp Ti =298K, Pi =650bar, Pf=1bar, Cp =29.3J/(mol K) So Tf =47.4K (2)W=N(Uf-Ui)=NCv(Tf-Ti)=(PiVi/RTi)Cv(Tf-Ti) Vi=0.167m3, Cv=Cp/Y, or Cv=Cp-R W=23020kJ
Problem #4
Prob 3. Air in a 0.5m3 cylinder is initially at a pressure of 10 bar and a temperature of 350K. The cylinder is to be emptied by opening the valve and letting the pressure drop to that of the atmosphere. What will be the temperature and mass of gas i
Notes
Entropy
Introductory Notes
Vctor R. Vsquez
Chemical Engineering Deparment
Spring Semester
Outline
Notes
1. Typical Engineering Problems
2. Entropy Basic Ideas and Evidence
3. Engineering Need and Evidence
4. Engineering Formulation
5. The Entropy Ba