# Top-rated ScreenCasts

Text Section | Link to original post | Rating (out of 100) | Number of votes | Copy of rated post |
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10.01 - Introduction to Phase Diagrams | Click here. | 84 | 5 |
Bubble, Dew, Flash Concepts and the Lever Rule (4:01) (msu.edu) Understanding what is present (known) and not present (unkown) for a given state of a system will help you decide which routine to use. Notation is introduced for liquids, vapor, and overall compositions. Also, the lever rule concept is used throughout the chemical engineering curriculum, but it is important to see how to use compositions for the lever rule. Comprehension Questions: 1. Which variables are fixed and which do you need to find in each of the following: |

13.05 - UNIFAC | Click here. | 82.8571 | 7 |
Unifac.xls Calculation of Bubble Temperature. (3 min) (LearnChemE.com) |

07.06 Solving The Cubic EOS for Z | Click here. | 82.8571 | 7 |
3. Using Preos.xlsx and Interpreting Output (11:38) (msu.edu) Comprehension Questions: 1. Is it possible to have a 1-root region below the critical temperature? 2. Is it possible to have a 3-root region above the critical temperature? 3. How does fugacity help us to identify the proper root to select? 4. Would argon at 5 MPa be in the 1-root or 3-root region? |

11.13 - Osmotic Pressure | Click here. | 80 | 3 |
MW of protein by osmotic pressure - (8:23) (learncheme.com) An application of osmotic pressure measurement to determine MW of a protein. |

09.05 - Fugacity and Fugacity Coefficient | Click here. | 80 | 2 |
What is fugacity? (10min) (learncheme.com) Defines fugacity in terms of Gibbs Energy and describes the need for defining this new property as a generalization of how pressure affects ideal gases. |

13.03 - NTRL | Click here. | 80 | 1 |
NRTL concepts (2:30) (msu.edu) The concepts on the development of the NRTL activity coefficient model. Comprehension Questions: 1. What value does the NRTL model assume for the coordination number (z)? |

09.05 - Fugacity and Fugacity Coefficient | Click here. | 80 | 2 |
In a contest for "the most hated word in Chemical Engineering," Comprehension Questions: 1.What is the fugacity of a vapor phase component in a mixture according to Raoult's law? |

13.04 - UNIQUAC | Click here. | 80 | 4 |
UNIQUAC concepts (6:44) (msu.edu) Concepts and assumptions used in developing the UNIQUAC activity coefficient method. This method introduced the use of surface area as an important quantity in calculation of activity coefficients. |

15.04 - VLE calculations by an equation of state | Click here. | 80 | 1 |
PRMix.xlsx - Tutorial on use for bubble pressure (msu.edu) (10:06) An overview of the organization of PRMix.xlsx, and a tutorial on the strategy to solve bubble pressure problems. Example 15.6 is worked in the screencast. After watching this screencast, you should be able to also solve dew or flash problems if you think about the strategy used to solve the problem. You may also be interested in a similar presentation from U.Colorado (learncheme, 6min). |

08.02 - The Internal Energy Departure Function | Click here. | 80 | 4 |
The Internal Energy Departure Function (11min, uakron.edu) Deriving departure functions for a variety of equations of state is simplified by transforming to dimensionless units and using density instead of volume. This also leads to an extra simplification for the internal energy departure function. Comprehension Questions: 1. What is the value of P for an ideal gas?2. What is the value of ( ∂U/∂V) for an ideal gas and how can you explain this result at the molecular scale?_{T}3. The Redlich-Kwong (RK) EOS is: P=RT/(V-b) -a/(V^{2}RT^{1.5}). Use Eqn. 8.13 to solve for (U-U)/^{ig}RT of the RK EOS.4. The RK EOS can be written as: Z = 1/(1-bρ) - aρ/(RT^{1.5}). Use Eqn. 8.14 to solve for (U-U)/^{ig}RT of the RK EOS. |