9.7 The virial equation for a binary mixture is RTPV=1+VBmix+ with Bmix=y12B11+y22B22+2y1y2B12 Here B11 and B22 are the second virial coefficients for pure species 1 and pure species 2, respectively, and B12 is the cross second virial coefficient. For a binary mixture a. Obtain an expression for the fugacity coefficient of a species (Eq, 9.4-6). b. Show that the activity coefficient for species 1 is ln1=12y22P/RT where 12=2B12B11B22. c. Generalize the results in part (b) to a multicomponent mixture