4.13. A solution of n-heptane (Hep) and n-octane (Oc) behaves ideally. Calculate the chemical potential of n-heptane in solution with n-octane relative to that of pure heptane when its mole fraction is 0.30 at its boiling point (117.6oC).

4.18. How do you find the chemical potential of ethanol (E) and n-propanol (P) in equilibrium with its vapor.

4.54. Which of the following liquids has a higher chemical potential; benzene (B) at 25oC and 1 atm or benzene in a 0.1 M toluene (T) solution in benzene at 25oC and 1 atm?