The entropy of pure crystalline substances at zero kelvin is zero according to the 3rd law of thermodynamics.
The entropy of solids (S) = kB.ln()NA
Where kB is the Boltzman constant, W is the degrees of randomness in the system
NA is the Avogadro's number
i.e. S = kB.NA.ln()
i.e. S = R ln()
Where R/NA = kB
And '' is the function of Avogadro's number (N), volume (V) and energy (E).
Therefore, S = kB.ln{(N,V,E)}
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