### Abstract

The recently proposed model [Geochim. Cosmochim. Acta 64 (2000) 495; Geochim. Cosmochim. Acta 64 (2000) 2779] for correlating the infinite dilution partial molar properties of aqueous nonelectrolytes is briefly outlined. The approach is fundamentally based on the A_{12} = V_{2}
^{0}/κRT parameter, related to the infinite dilute solute-water direct correlation function integral. The A_{12} parameter is considered as a semiempirical function of temperature and density. At supercritical temperatures thermodynamic integrations of this function allow calculation of all thermodynamic functions of hydration (V_{2}
^{0}, Δ_{h}G^{0}, Δ_{h}H^{0} and Δ_{h}C_{p}
^{0}) of a solute. An extension to subcritical conditions is done using an auxiliary Δ_{h}C_{p}
^{0}(T, P_{r})-function, which describes the temperature course of the heat capacity of hydration of a solute at P_{r} = 28 MPa and subcritical temperatures. The variations of the Δ_{h}C_{p}
^{0}(T, P_{r})-function are constrained by known values of Δ_{h}G^{0}, Δ_{h}H^{0} and Δ_{h}C_{p}
^{0} at ambient and supercritical conditions. This model, which was used earlier to correlate properties of a few dissolved gases, is successfully employed here to describe V_{2}
^{0}, Δ_{h}G^{0}, Δ_{h}H^{0} and Δ_{h}C_{p}
^{0} experimental results for a number of aqueous nonelectrolytes, including ones of high polarity (alcohols, amines, acids and amides) and/or large size (hexane and benzene).

Original language | English (US) |
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Pages (from-to) | 133-142 |

Number of pages | 10 |

Journal | Fluid Phase Equilibria |

Volume | 183-184 |

DOIs | |

Publication status | Published - Jul 1 2001 |

Externally published | Yes |

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### Keywords

- Chemical potential
- Enthalpy
- Equation of state
- Fugacity
- Gibbs energy
- Heat capacity
- Model
- Volume

### ASJC Scopus subject areas

- Fluid Flow and Transfer Processes
- Physical and Theoretical Chemistry

### Cite this

*Fluid Phase Equilibria*,

*183-184*, 133-142. https://doi.org/10.1016/S0378-3812(01)00427-7