Why Don't Oil and Water Mix at Room Temperature?

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SUMMARY

Water and oil do not mix at room temperature due to differences in entropy and free energy. The calculated entropy is -(Kb)ln(2), and the free energy is (Kb)(T)ln(2), indicating that the mixing process is energetically unfavorable. The discussion highlights the role of hydrophobic interactions, where water molecules exhibit reduced multiplicity around hydrophobic molecules, leading to a stable separation of the two liquids. This phenomenon is primarily driven by thermodynamic principles rather than endothermic or exothermic reactions.

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  • Understanding of thermodynamic concepts such as entropy and free energy
  • Familiarity with Boltzmann's constant (Kb)
  • Knowledge of hydrophobic interactions in molecular chemistry
  • Basic principles of endothermic and exothermic reactions
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Homework Statement



Explain why water and oil doesn't mix at room temperature using the entropy and free energy that you found to explain.

Homework Equations



The entropy that I found is -(Kb)ln(2) and the free energy is (Kb)(T)ln(2).

The Attempt at a Solution



Can someone direct me in the right path how to go about this question. I'm thinking it might be do to endothermic and exothermic reactions but I'm not sure.
 
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You found the entropy and free energy of what?
 
I found it for water molecules around a hydrophobic molecule when multiplicity is reduced from 6 to 3
 

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