Heat and Ideal Gas Homework: Point 3 Pressure Calculation

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Homework Help Overview

The discussion revolves around a problem related to heat and ideal gases, specifically focusing on pressure calculations at different points in a system. Participants are examining the relationships between volume and pressure at these points, particularly in the context of a test question.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss assumptions regarding the volumes at different points, questioning whether the pressure at point 3 can be assumed to be the same as at point 1. There is an exploration of using the ideal gas law and adiabatic processes to relate the variables involved.

Discussion Status

The discussion is ongoing, with participants sharing their attempts and reasoning. Some guidance has been offered regarding the validity of methods used, but no consensus has been reached on the assumptions made or the final calculations.

Contextual Notes

There is a mention of limited information provided in the problem statement, which may affect the assumptions participants are making about the system. Additionally, the context of this being a test question adds a layer of urgency to the discussion.

element72
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Homework Statement


Look at picture



The Attempt at a Solution


For V at point 3 I got 4.52 x 10^(-2)
For V at point 2 I assumed it was the same as Point 1, but this is where it gets confusing because if I assume that, then does point 3 have the same pressure as point 1?

This was actually on my test I just took! and that's all the given info she gave me. Please let me know what you get.
 

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Show me your work?
 
dacruick said:
Show me your work?

I used the formula PV = nRT for Point 1 and solved for V1 = 2.46x10^(-2)
I made the assumption that V2 = V1

Then I used the adiabatic formula, TV^(gamma - 1) = constant for Point 2 to Point 3.
I just plugged in everything and got V3 = 4.52 x 10^(-2)

Do you really want me to type out all the steps I did? because I am doing this at least 3 times over and I'm getting the same thing.
 
Well you typing out all of the steps allows me to help you without doing the steps myself. I'm lazy enough to not want to do the question, but I am still willing to help lol.

Your method looks right, and the answer coincides with your graph. So I say its good.
 

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