delS at Equilibrium

[Pranav Kadiyala 1A]

We say delS at equilibrium is equal to 0 because S is at a max. However, for phase changes which represent equilibrium, there is a clear change in entropy as a substance goes from liquid to gas, or solid to liquid. What is the reasoning behind this discrepancy?

[Chem_Mod]

If the substance is changing phase, it is not at equilibrium. It will be at equilibrium once the process is complete

[Abraham De Luna]

when the substance is going through a phase change it is not at equilibrium.

[Rachel Kwan 1B]

Is deltaS = 0 at equilibrium due to the fact that the particles are changing from liquid to gas states and vice versa at equal rates, and therefore the changes in entropy cancel each other out?

[Moura Girgis 1F]

It would not be at equilibrium when changing phase, only once the process is complete.

[Sera Aintablian 2E]

Different phases may be in equilibrium, because the chemical potential of the components present in the system are steady with time. For example, liquid and gas phases are in equilibrium at the boiling temperature, because there are more molecules in the gas, so the gas pressure is higher and the rate at which gas molecules condense and enter the liquid is faster. They are in equilibrium with each other at a higher temperature. However, phase CHANGES do not occur AT equilibrium; entropy is present.