Chemical Thermodynamics Example Assume vapor pressure of the - - PowerPoint PPT Presentation

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Dec 06, 2022 509 likes •603 views

Chemical Thermodynamics Example Assume vapor pressure of the components in solution can be represented by a 2 * X P X P e 2 1 1 1 a 2 * X P X P e 1 2 2 2 What is the relationship between a and b ?

SLIDE 1

Chemical Thermodynamics

SLIDE 2

Example



Assume vapor pressure of the components in solution can be represented by



What is the relationship between a and b?

CEM 484 Chemical Thermodynamics 2

2 1 2 2

* 2 2 2 * 1 1 1 X X

e P X P e P X P

a a

 

SLIDE 3

Activities



Hide all non-ideal aspects in activity coefficient

CEM 484 Chemical Thermodynamics 3

SLIDE 4

Activities



For a dilute solution of solute j in solvent i:

CEM 484 Chemical Thermodynamics 4

SLIDE 5

Activities



Common concentration units can be written in terms of activity.



Molality



Molarity

CEM 484 Chemical Thermodynamics 5

SLIDE 6

Chemical Equilibrium



For a generic chemical reaction, define the extent

f reaction.



Look at Gibbs free energy as a function of reaction extent.

CEM 484 Chemical Thermodynamics 6

SLIDE 7

Chemical Equilibrium



Derivative of Gibbs free energy relative to reaction extent can help define the location of equilibrium.

CEM 484 Chemical Thermodynamics 7

SLIDE 8

Chemical Equilibrium



Continued ….



Results in the equilibrium constant, K.

CEM 484 Chemical Thermodynamics 8