Max Phases in Binary Mixture EQ: Gibbs Phase Rule

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SUMMARY

The maximum number of phases in a binary mixture at equilibrium, according to the Gibbs phase rule, is determined using the formula F=C-P+2. For a binary mixture, where the number of components (C) is 2, the calculation yields a maximum of 4 phases (P=4) when the degrees of freedom (F) are set to 0. If one mole fraction is known, the system can only support 3 phases (P=3) with one degree of freedom remaining. Thus, the correct interpretation confirms that a binary mixture consists of 2 components.

PREREQUISITES
  • Understanding of Gibbs phase rule
  • Familiarity with the concept of phases in thermodynamics
  • Knowledge of mole fractions in mixtures
  • Basic algebra for solving equations
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  • Study the implications of the Gibbs phase rule in multi-component systems
  • Explore phase diagrams and their applications in chemical engineering
  • Learn about the behavior of different phases in binary mixtures
  • Investigate the role of temperature and pressure in phase equilibria
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Chemical engineers, thermodynamics students, and researchers working with phase equilibria in binary mixtures.

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Homework Statement


Acording to the Gibbs phase rule, what is the maximum number of phases that one may observe for a binary mixture in equilibrium?

Homework Equations


phase rule
F=C-P+2

The Attempt at a Solution


It says binary mixture but does it mean there are 2 component(C=2)?
I think we can know one mole fraction and we can know another so C=1
I found the answer for this problem is 4 from 0=2-P+2 P=4
but if C=1 0=1-P+2 P=3
 
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Oh I lost some words
I mean if one of the two mole fraction is known and the other is known so C=1
what is the correct answer ? maximum number of phase is 3 or 4?
 
Last edited:
hgnk708113 said:
It says binary mixture but does it mean there are 2 component(C=2)?
Yes, that's what it means.
 
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