Question

The criteria for phase equilibria is

• A. The chemical potential of each species is same in all phases at the same T and P
• B. The chemical potential of each species is same in all phases at the same P
• C. The concentration of each species is same in all phases
• D. The entropy of each species is same in all phases at the same T and P

Hint:

Phase equilibrium → chemical potentials equal in all phases at equilibrium T and P.

Answer 1

The Correct Option is A

Phase equilibrium is achieved when the chemical potential of a component is equal in all phases.
This ensures no net mass transfer and thermodynamic equilibrium across phases.