Entropy is the degree of randomness or disorderness of a system , so forming a ordered network will decrease the entropy of water.
And the molecules that lack polar groups cannot readily form micelles as it is the polarity that orients the hydrocarbon chain into micelles , so without the polar groups , it would be difficult.
Nonpolar molecules that have no polar groups (e.g. hydrocarbons) can readily form micelles.
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extra info:
Problem 6.7. Entropy as an extensive quantity (a) Because the entropy is an extensive quantity, we know that if we double the volume and double the number of particles (thus keeping the density constant), the entropy must double. This condition can be written formally as S(T, WV, AN) = AS(T,V, N). (6.30 Although this behavior of the entropy is completely general, there is no guarantee that an approximate calculation of S will satisfy this condition. Show that the...