Chemical Thermodynamics by Ernő Keszei

Author:Ernő Keszei
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

(7.110)

Let us recall that two cases included in the table – the decrease of the vapor pressure and the depression of the freezing point – are already discussed in previous sections. To calculate the decrease of the vapor pressure, in analogy of (7.51), we can start with the equilibrium condition

(7.111)

where p * is the equilibrium vapor pressure of the pure liquid at temperature T. We can write a similar equation for the equilibrium of the pure liquid and its vapor:

(7.112)

By subtracting this from the previous equation, we get the vapor pressure of pure component A in equilibrium with the liquid mixture of composition x A:

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