Working in the molar scale

Expressing the overall solvation (Kirkwood-Buff integrals) in terms of molarities ci requires a slightly different approach than seen earlier for molalities mi. In the molal scale we expressed the Gy in terms of a matrix

A of experimental properties. In the molar scale we do the opposite and express experimental properties in terms of a matrix B of Kirkwood-Buff integrals. We start with the derivative of the chemical potential, which is (Kirkwood and Buff, 1951)

= RTjik

The matrix elements are

Transformation from constant volume to constant pressure results in lBl ik v^k

where the partial volumes are given by

J2rlCkCl W

and the compressibility is kRT =

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