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Hi all. I have some confusion regarding the fugacity coefficient of a species in an ideal solution so hoping someone could clear it up for me. According to my textbook, for fugacity coefficient of a species i in a solution:

So if we were talking about an ideal liquid mixture of let's say species A and B, then the denominator y

So if we were talking about an ideal liquid mixture of let's say species A and B, then the denominator y

_{i}should be replaced by x_{i}as per stated by the textbook. So if i were to calculate the fugacity coefficient of species A, my question is what is the physical significance of x_{A}P? is it the vapour pressure of the vapour of species A above the liquid components? Why is it calculated in such a way (seems like the same way as how partial pressure of gas mixture is calculated). From what i know, the calculation of vapour pressure of a species in ideal mixture should be x_{i}Po where Po is the vapour pressures of i if it were to exist as pure liquid