Calculating Heat Required for Compressed Gas to Become a Gas Again

AI Thread Summary
To calculate the heat required for a compressed gas, such as freon, to revert to a gaseous state, one should research concepts like latent heat and heat of vaporization. The discussion highlights the need to determine how much energy is absorbed from the air during this phase change, specifically at a pressure of 14.7 psi. The user is focused on finding the amount of freon needed to absorb approximately 22 kJ of energy, noting that the latent heat value is around 150 kJ/kg. To solve the problem, the user seeks a formula or method to relate the energy absorbed to the mass of freon required. Understanding these thermodynamic principles is essential for accurate calculations in phase changes.
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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