Water Activity from Equilibrium Molecular Dynamics Simulations and Kirkwood-Buff Theory.Water activity and related thermodynamic properties are calculated for several aqueous solutions using equilibrium molecular dynamics in conjunction with the recent extension of the Kirkwood-Buff (KB) theory for closed systems.  Comparison of water and solute excess chemical potentials against other molecular simulation techniques for NaCl/water mixtures shows the SKBMD method to be competitive in performance with those requiring additional external constraints or computational complexity. 
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