How Do You Calculate Values Using pV Diagrams for a Monatomic Gas?

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Discussion Overview

The discussion revolves around calculating values using pV diagrams for a monatomic gas, specifically in the context of a thermodynamics assignment. Participants are addressing the interpretation of a provided graph and the associated processes.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant expresses difficulty with the assignment and requests assistance regarding the graph and processes for a monatomic gas.
  • Another participant emphasizes the need for the original poster to demonstrate some effort before receiving help.
  • A participant claims to have solved part of the assignment, providing specific values for segments AB, BC, and AD, while stating that AB and DC are zero due to being constants.
  • A later reply asks for clarification on the equations used to arrive at the calculated values.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as participants are at different stages of problem-solving, and there is a request for further clarification on the calculations.

Contextual Notes

The original poster's understanding of the material and the specific equations relevant to the problem have not been established, which may affect the clarity of the discussion.

cheetah
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Homework Statement
Consider the processes shown in Fig. 1 for a monatomic gas.
a) Find the work done in each of the processes AB, BC, AD, and DC.
b) Find the internal energy change in processes AB and BC.
c) Find the internal energy difference between states C and A.
d) Find the total heat added in the ADC process.
e) From the information given, can you find the heat added in process AD? Why or why
not?
Relevant Equations
Eint = Q − W
I’m having trouble with a Thermodynamics Assignment and could use some help. I’ve been given the below graph and told to consider the processes shown for a monatomic gas. I’ve been asked to answer these questions with no further information besides the graph.
1710793385005.png
 
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Welcome to PF. :smile:

We are not allowed to help you until you show some effort on your problem. What parts can you start working on? It's hard to believe you have been given this question without the material having been covered in class or in your textbook.
 
I believe I've solved question a.
AB and DC = 0 (since they're constants)
BC = 20 (2026J)
AD = 8 (810.4J)
 
That's helpful. What equations did you use to calculate those values?
 

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