Isobaric Expansion for Ideal Gas

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Homework Help Overview

The discussion revolves around the isobaric expansion of an ideal gas, with given initial conditions including pressure, volume, and temperature. Participants are exploring the implications of these conditions on the final state of the gas after expansion.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the initial and final states of the gas, questioning whether the provided values represent the initial state. There is an exploration of the relationships between pressure, volume, and temperature during isobaric processes, with some participants attempting to apply the ideal gas law.

Discussion Status

The discussion is active, with participants clarifying the initial and final states of the gas. Some guidance has been offered regarding the relationships between the states, but there is no explicit consensus on the approach to finding the final temperature.

Contextual Notes

Participants are working under the assumption that the pressure remains constant during the expansion, and there is a focus on deriving the final temperature based on the ideal gas law. The mention of moles and their equivalence between initial and final states is also a point of discussion.

Windseaker
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Given: working fluid is an Ideal gas

P=30 psi
V=2ft3
T=20degreeC

Q. what is initial state of the gas when?

Isobaric expansion to 3ft3
 
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Isn't what they gave you the initial state of the gas?
 
ok finial state--sorry
 
Since the expansion is isobaric, the pressure stayed the same. They also specified the final volume, so all you need is the final Temperature. You already know the initial states for PiVi = nRTi (except for the moles); the final temperature in PfVf = nRTf can be found by setting the moles of the initial state and the moles of the final state equal to each other.
 
I through is was

PiVi/Ti = P2V2/T2 ?
 
Windseaker said:
I through is was

PiVi/Ti = P2V2/T2 ?

P1V1 = nRT1
P2V2 = nRT2

nR = P1V1/T1 = P2V2/T2
 

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