The process initially includes coconut waste in hexane. Entropy
of the mixture increases due to the oil molecules extraction. The
positive value of entropy change describes the process is irreversible
which is in agreement with other findings (Amin et al., 2010;
Meziane and Kadi, 2008; Topallar, 2000). The free energy and entropy
values lie between 0.12–1.16 kJ/mol and 33.10–38.24 J/
mol K, respectively for both of the extractor using hexane. Free energy
and entropy of extraction using petroleum ether varies between
0.23–1.25 kJ/mol and 33.31–39.57 J/mol K for 1.2, 0.7 and
0.5 mm of particle size respectively. This shows that the energy required
to break the solute–solute and solvent–solvent interactions
are less than the energy released in solute–solvent interactions