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In a previous work, we investigated a two-dimensional lattice-fluid model,displaying some waterlike thermodynamic anomalies. The model, defined on atriangular lattice, is now extended to aqueous solutions with apolar species.Water molecules are of the "Mercedes Benz" type, i.e., they possess a D3(equilateral triangle) symmetry, with three equivalent bonding arms. Bondformation depends both on orientation and local density. The insertion of inertmolecules displays typical signatures of hydrophobic hydration: large positivetransfer free energy, large negative transfer entropy (at low temperature),strong temperature dependence of the transfer enthalpy and entropy, i.e., large(positive) transfer heat capacity. Model properties are derived by ageneralized first order approximation on a triangle cluster.Comment: 9 pages, 5 figures, 1 table; submitted to Phys. Rev.

Hydration of an apolar solute in a two-dimensional waterlike lattice fluid