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Gases Reales

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Incluye la teoría necesaria para realizar el estudio del comportamiento de los gases reales en sistemas cerrados y abiertos.

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Uploaded on
February 18, 2023
Number of pages
10
Written in
2022/2023
Type
Class notes
Professor(s)
Isabel pérez grande
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COMPORTAMIENTO P.VT GASES. RELACIONES GENERALIIADAS




Comportamientop.V.T gases.
-




Mecanica
-



[quilibria · Gas perfect o


↳cracion de estado
flp, v, +)=o
· Liquid perfecto
peppio: a) h) Modelo de sustancia
-> bas real- Seusara Chando las
-

2°ppio: s |




pressiones seen elevadas.


cilindro- embolo
Suponemes que tenemos un dispositive con un
gas ensuinterior.


Hacemos an experiments a temperature constants.

FUEREAS DE INTERACCION MOLECULAR EN FUNCION DE LA DISTANCIA


Fij
T
Liquidos




& a
y




"OAS a
P


The
Y


g

v= V /m



1 1p, T,V) GASES REALES


x
4 Fluido dense
PC: Punto de maxima presion para ecualse experimenta un cambio defuse de
zona de gas real
gas a


PC




&lice
liquido. Is ecacion the ajusta el models de
gases ideals
a
una


8 (p, v, T) =0 a el models de
gases reales.
y
=>
ona de gas ideal

T #


CTE
(pr:RgT) Imacion de VanderWaals:
IV.b)/p+al=RgT
v
HECHOS EXPERIMENTALES IN TODOSLOS GASTS



11) line Pr=RgT - A presiones bajas los gases se comportan come
gases ideals.
= 8
p



12)
lim Glpr)-vsi)-Volumenresilient
a "P 2P
13 J
-


-

2r2 Gr
J,p, Tc, PC



(n)
lima Vxc20,260c

, AJUSTE DE UN PARAMETRO:FACTOR DE COMPRESIBILIDAD



E pr E FIT,P, gas particular) E= [/T, p, Tc,Pc) EITR T/c, PR P/Pc)
= =
+ =

= en =




RgT E
X
(1) lim E 1 =

N


48
P

1.
TR
0.ei
-b(ERgT)
(2) 27
lim RgTlin
- =
=




p +
02p T




TBOTLE VO (TBOTLE) 8
: =


lim
:
aE j
=
i ·
p=0 GP 1
PR
T10422




AJUSTES DE DOS PARAMETROS
Covolumen
b= (has moleculas occupan volument

Echacioie de Van der Waals:(v.b)(p
+q) RgT
=




> a =Fuerzasbe interaccion molecularla pression queda corregida.

a b son constantes propias decade gas
a
-

a(Tc,Pc)
=




22P
f(T,v.a,b) Recordamos
que:2P =o
Sacamosque
= >
=
P
2V8
c,p, To, P. b b(Tc,Pc)
=




Definimos las variables reducidas:


Nomenclatura:subindice"R'
-




·
presion reducida:PR P/PC =
Calculamos las constantes a"job"en elpunto critica


·

Temperatura reducida:TRTIC pc Rgas Tc
=
.
a


Vc - bv,

Volumen reducido (pseudo reducido):VR "/Xc
· =




2P
= x -
RTc + 2a 0
=
- a spcX,
=




2v
TC
(c b)2 -
Vc3


PR 8TR
Y
Gando p PC S del
I No depende
-




gas
=
=




22p 2RTC 6a 3VR -1VR
>b estudiado.
=8 =8
v
=

; ·




2vz Nc-b12 VCY
TC




ESTADOS CORRESPONDENTES:Aquellos que tienen distintas sustancias cuando tienen dos de las tres variables reducidas iguales.

Sustancia A Sustancia B




PRA =

PA, PRB =

PBz Sides fluids tienen dos de las tres variables reducidas iquales obligatoriaments

la tercer a tambien tiene
TRA
1( TRB TB
que serignal.
= =




, TCB


VRA = VA VRB VB =




VCA Vc
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