Ch01-C-real gases

Ch01-C-real gases - CHM 341 Elementary Physical Chemistry...

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Chapter 1: Real Gases CHM 341 Elementary Physical Chemistry Fall 2009 Ranko Richert
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interactions in real gases:
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forces and potential energy: potential energy E ( r ) separation r 0 0 repulsive contribution E rep ( r ) attractive contribution E attr ( r ) E ( r )= E attr ( r ) + E rep ( r ) () 0 0 distance m equilibriu eq = = = F dr r dE r r r () 0 0 regime repulsive eq > < < F dr r dE r r r () 0 0 regime attractive eq < > > F dr r dE r r r () dr r dE F =
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experimental isotherms of carbon dioxide, CO 2 clearly not close to the behavior of a perfect gas critical point: occurs only at T C , p C , V C T C : critical temperature p C : critical pressure V C : critical volume at T > T C the gas is dense and called supercritical fluid the clearcut discrimination between liquid and gas is lost for temperatures T > T C perfect gas: V m ( p =1atm, T =20°C) = 24 L mol -1 supercritical fluid range liquid / vapor coexistence area
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Z () () RT pV Z RTZ pV T p
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This note was uploaded on 10/10/2009 for the course CHM 341 taught by Professor Richert during the Spring '08 term at ASU.

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Ch01-C-real gases - CHM 341 Elementary Physical Chemistry...

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