Values of the conformational entropy contributionS _c to the melting entropyS _m are calculated from a recently reported equation of state (Jain and Simha), and compared with theoretical valuesS _c derived from the rotational isomeric state approximation. For the shortern-alkanesS _c is considerably larger thanS _c , whereas for the longern-alkanes the conformational entropy contribution can approximately be described with the rotational isomeric state model. Equations are presented for the calculation of specific volumes at the melting temperature as a function of chain length.