s V1 1 x1 Keq s K 1 s K x1 K V2 x1 1 x3 Keq x1 K 1 x1 K x3 K V3 x1 1 x2 Keq x1 K 1 x1 K x2 K V4 1 p1 Keq x2 x2 K 1 p1 K x2 K V5 1 p2 Keq x3 x3 K 1 p2 K x3 K