Question

At freezing point which one of the following coexists in dynamic equilibrium:
(a) gas and solid
(b) liquid and gas
(c) liquid and solid
(d) all of these
I need a proper answer plz just dont select any option if you dont know the valid answer ​

Answer 1

Answer:

At freezing point (c) liquid and solid coexists in dynamic equilibrium.

Explanation:

When two stages are in equilibrium the chemical potential of the atoms/molecules within side the stages are the same. If you are now no longer acquainted with the idea of chemical potential it basically just means that the molar Gibbs free energies of the 2 stages are same so the ΔG for the phase change is zero.

The argument is:

If the liquid and vapour are in equilibrium then the chemical potential within side the liquid $\mu_l$ and vapour $\mu_v$ ought to be the equal: $\mu_l=\mu_v$.

If the solid is likewise in equilibrium with the vapour then the chemical potential of the strong $\mu_s$ and vapour $\mu_v$ also are the equal: $\mu_s=\mu_v$.

And which means that the chemical potential of the liquid and solid ought to be the equal, due to the fact each are similar to the vapour: $\mu_s=\mu_l=\mu_v.$

And in the end if the chemical potential of the liquid and solid are the equal then it means the liquid and solid are in equilibrium i.e. we're at the freezing/melting point.

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