Consider a closed system consisting of liquid water in equilibrium with its vapo

Question

Consider a closed system consisting of liquid water in equilibrium with its vapor (with vapor pressure P) at 298K.

A) What is the relationship between the chemical potentials of the liquid and the vapor in this system?

B) From the relationship in part a and other information about chemical potentials, derive the following expression:

?*liquid ??°gas = RT ln(P/P°) State any assumptions you make.

C) Show how the left hand side of the above equation can be calculated using the ? fG° values for liquid water and water vapor. Make sure you EXPLAIN this clearly because it is not true that ?liquid* = ? fG° (liquid), for example.

D) Use your result from part c and the table below to calculate the vapor pressure of water at 298K. Compare your result to the experimental value of 3.169 × 10?2 bar.

E) Would you expect a similar calculation to be more or less accurate for hexane than for

water? EXPLAIN.

Explanation / Answer

Consider a closed system consisting of liquid water in equilibrium with its vapo

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