# 8.3: Action Item

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Answer the following problems, and submit your answers to the drop box in ANGEL that has been created for this module.

• Your answers must be submitted in the form of a Microsoft Word document.
• Include your Penn State Access Account user ID in the name of your file (for example, "module2_abc123.doc").
• The due date for this assignment will be sent to the class by e-mail in ANGEL.
• Your grade for the assignment will appear in the drop box approximately one week after the due date.
• You can access the drop box for this module in ANGEL by clicking on the Lessons tab, and then locating the drop box on the list that appears

### Problem Set

1. Consider Methane  (Pc = 666 psia, Tc = – 117 F) and Ethane (Pc = 706 psia, Tc = – 90 F) stored in two different vessels at the following conditions:
 Methane Vessel P = 1332 psia T = 55 F Ethane Vessel P = 1412 psia T = 95 F

Using the Standing-Katz Z-factor plot, determine the compressibility factor of both substances. Any observation? Are those values different? Describe the situation for both gases. If their Z-factors are the same, does it mean that both gases have the same density? What does it mean?

### Contributors

• Prof. Michael Adewumi (The Pennsylvania State University). Some or all of the content of this module was taken from Penn State's College of Earth and Mineral Sciences' OER Initiative.