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## Summary:

- Where did it say in stat-mech that the second virial coefficient of a mixture must be quadratically composition-dependent?

I am quite unsure where to post this, as I am a chemical engineer and that I am working with phase equilibrium. My issue however is regarding statistical mechanics, thus me posting my problem here.

I keep on encountering that the second virial coefficient of a mixture must be quadratically composition-dependent, and that it is stipulated in statistical mechanics that it must be so.

May I know what, why, or where did this 'stipulation from statistical mechanics' come from?

I keep on encountering that the second virial coefficient of a mixture must be quadratically composition-dependent, and that it is stipulated in statistical mechanics that it must be so.

May I know what, why, or where did this 'stipulation from statistical mechanics' come from?