Consider the gas-solid equilibrium under the extreme assumption that the entropy of the solid may be neglected
Question:
(a) Show that the total Helmholtz free energy of the system is
F =Fs + Fθ = – Nsε0 + Ngτ[log(Ng/VnQ) – 1]’
Where the total number of atoms, N = Ns + Ng is constant.
(b) Find the minimum of the free energy with respect to Ng; show that in the equilibrium condition
Ng = nQVexp(–ε0/τ).
(c) Find the equilibrium vapor pressure.
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