Physical Chemistry Real gases Gas Mixtures For a mixture of two gases, 1 and 2, use a two-parameter equation, a=x a,+2x,x,(a, a,) 2+xa, and b=x, 6,+x,b,( 8.10) x and x,: the mole fractions of the components b: a weighted average of b, and b a: related to intermolecular attractions (a,a2) 2: intermolecular interaction between gases 1 and 2 mean molar volume (8.11)Gas Mixtures 2 1 1 2 2 2 2 1/ 2 1 1 2 1 2 2 1 a = x a + 2x x (a a ) + x a and b = x b + x b (8.10) For a mixture of two gases, 1 and 2, use a two-parameter equation, (8.11) tot m n V V  mean molar volume Physical Chemistry Real Gases x1 and x2 : the mole fractions of the components b: a weighted average of b1 and b2 a: related to intermolecular attractions (a1a2 ) 1/2: intermolecular interaction between gases 1 and 2