Calculating Heat Required for Compressed Gas to Become a Gas Again

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Homework Help Overview

The discussion revolves around calculating the energy required for a compressed gas, specifically freon, to transition from a liquid state back to a gaseous state. Participants are exploring concepts related to phase changes and the associated energy requirements.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to identify relevant terms and formulas, such as 'latent heat' and 'heat of vaporization', to understand the energy dynamics involved in the phase change of freon. Questions about how to quantify the energy needed for a specific amount of heat absorption are also raised.

Discussion Status

Some participants have suggested researching latent heat values and have begun to calculate the energy needed for a specific heat absorption scenario. However, there is no explicit consensus on the next steps or a clear method outlined yet.

Contextual Notes

Participants express uncertainty about their foundational knowledge and seek clarification on how to approach the problem, indicating a potential gap in understanding the underlying physics concepts.

whatmough
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I don't know what to research or where to start but I would like to know much energy a compressed gas a requires to turn back into a gas if it is a liquid. Is there a term I should research and a formula like with specific heat?

The problem I am trying to solve is how much heat does X units of say freon for example absorb from the air when it goes to stap (? 14.7 psi).

Its been a while since I have been out of grade 10 physics so excuse my stupidity...
 
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If you are looking at a phase change between gas and liquid you should look at stuff like 'latent heat' and 'heat of vaporization'.
 
Thanks I have read a bit but am still stuck... Where do I start?

I want to see how much freon needs to change state from liquid to gas to absorb about 22kJ of energy...
 
Keep looking, I'm finding values like 150kJ/kg for the latent heat. So how much to do 22kJ?
 

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